diff --git a/chatterino.pro b/chatterino.pro
index 3b704d192..068fdf9e1 100644
--- a/chatterino.pro
+++ b/chatterino.pro
@@ -170,7 +170,8 @@ HEADERS  += \
     src/widgets/splitcontainer.hpp \
     src/widgets/helper/droppreview.hpp \
     src/widgets/helper/splitcolumn.hpp \
-    src/util/irchelpers.hpp
+    src/util/irchelpers.hpp \
+    src/util/helpers.hpp
 
 
 PRECOMPILED_HEADER =
diff --git a/src/channel.cpp b/src/channel.cpp
index 51b599b44..da7643d62 100644
--- a/src/channel.cpp
+++ b/src/channel.cpp
@@ -38,6 +38,13 @@ void Channel::addMessage(std::shared_ptr<Message> message)
 {
     std::shared_ptr<Message> deleted;
 
+    const QString &username = message->username;
+
+    if (!username.isEmpty()) {
+        // TODO: Add recent chatters display name. This should maybe be a setting
+        this->addRecentChatter(username);
+    }
+
     //    if (_loggingChannel.get() != nullptr) {
     //        _loggingChannel->append(message);
     //    }
@@ -49,6 +56,24 @@ void Channel::addMessage(std::shared_ptr<Message> message)
     this->messageAppended(message);
 }
 
+void Channel::addRecentChatter(const QString &username)
+{
+    std::lock_guard<std::mutex> lock(this->recentChattersMutex);
+
+    this->recentChatters.insert(username);
+}
+
+std::set<QString> Channel::getUsernamesForCompletions()
+{
+    std::set<QString> usernames;
+
+    this->recentChattersMutex.lock();
+    usernames.insert(this->recentChatters.begin(), this->recentChatters.end());
+    this->recentChattersMutex.unlock();
+
+    return usernames;
+}
+
 bool Channel::canSendMessage() const
 {
     return false;
diff --git a/src/channel.hpp b/src/channel.hpp
index ceca68f28..685503dbf 100644
--- a/src/channel.hpp
+++ b/src/channel.hpp
@@ -13,6 +13,7 @@
 #include <boost/signals2.hpp>
 
 #include <memory>
+#include <set>
 
 namespace chatterino {
 namespace messages {
@@ -30,16 +31,21 @@ public:
     virtual bool isEmpty() const;
     messages::LimitedQueueSnapshot<messages::SharedMessage> getMessageSnapshot();
 
-    // methods
     void addMessage(messages::SharedMessage message);
+    void addRecentChatter(const QString &username);
+
+    std::set<QString> getUsernamesForCompletions();
+
     QString name;
     QStringList modList;
 
+    std::mutex recentChattersMutex;
+    std::set<QString> recentChatters;
+
     virtual bool canSendMessage() const;
     virtual void sendMessage(const QString &message);
 
 private:
-    // variables
     messages::LimitedQueue<messages::SharedMessage> messages;
 
     // std::shared_ptr<logging::Channel> loggingChannel;
diff --git a/src/channelmanager.cpp b/src/channelmanager.cpp
index 6371de46e..3df5e97e4 100644
--- a/src/channelmanager.cpp
+++ b/src/channelmanager.cpp
@@ -5,6 +5,8 @@ using namespace chatterino::twitch;
 
 namespace chatterino {
 
+ChannelManager *ChannelManager::instance = nullptr;
+
 ChannelManager::ChannelManager(WindowManager &_windowManager, IrcManager &_ircManager)
     : windowManager(_windowManager)
     , ircManager(_ircManager)
@@ -12,6 +14,7 @@ ChannelManager::ChannelManager(WindowManager &_windowManager, IrcManager &_ircMa
     , mentionsChannel(new TwitchChannel(_ircManager, "/mentions", true))
     , emptyChannel(new TwitchChannel(_ircManager, "", true))
 {
+    ChannelManager::instance = this;
 }
 
 const std::vector<std::shared_ptr<Channel>> ChannelManager::getItems()
diff --git a/src/channelmanager.hpp b/src/channelmanager.hpp
index 0484360c4..02200e646 100644
--- a/src/channelmanager.hpp
+++ b/src/channelmanager.hpp
@@ -16,6 +16,8 @@ class ChannelManager
 public:
     explicit ChannelManager(WindowManager &_windowManager, IrcManager &_ircManager);
 
+    static ChannelManager *instance;
+
     WindowManager &windowManager;
     IrcManager &ircManager;
 
diff --git a/src/completionmanager.cpp b/src/completionmanager.cpp
index 51dfa41a3..520cf1d6e 100644
--- a/src/completionmanager.cpp
+++ b/src/completionmanager.cpp
@@ -1,11 +1,12 @@
 #include "completionmanager.hpp"
+#include "channelmanager.hpp"
 #include "common.hpp"
 #include "debug/log.hpp"
 #include "emotemanager.hpp"
 
 namespace chatterino {
 
-CompletionModel::CompletionModel(const std::string &_channelName)
+CompletionModel::CompletionModel(const QString &_channelName)
     : channelName(_channelName)
 {
 }
@@ -39,14 +40,14 @@ void CompletionModel::refresh()
 
     // Channel-specific: BTTV Channel Emotes
     std::vector<std::string> &bttvChannelEmoteCodes =
-        emoteManager.bttvChannelEmoteCodes[this->channelName];
+        emoteManager.bttvChannelEmoteCodes[this->channelName.toStdString()];
     for (const auto &m : bttvChannelEmoteCodes) {
         this->addString(m);
     }
 
     // Channel-specific: FFZ Channel Emotes
     std::vector<std::string> &ffzChannelEmoteCodes =
-        emoteManager.ffzChannelEmoteCodes[this->channelName];
+        emoteManager.ffzChannelEmoteCodes[this->channelName.toStdString()];
     for (const auto &m : ffzChannelEmoteCodes) {
         this->addString(m);
     }
@@ -57,7 +58,17 @@ void CompletionModel::refresh()
         this->addString(":" + m + ":");
     }
 
-    // TODO: Add Channel-specific: Usernames
+    // Channel-specific: Usernames
+    auto *channelManager = ChannelManager::instance;
+    auto c = channelManager->getTwitchChannel(this->channelName);
+    if (!c) {
+        return;
+    }
+    auto usernames = c->getUsernamesForCompletions();
+    for (const auto &username : usernames) {
+        this->addString(username);
+        this->addString('@' + username);
+    }
 }
 
 void CompletionModel::addString(const std::string &str)
@@ -66,6 +77,12 @@ void CompletionModel::addString(const std::string &str)
     this->emotes.push_back(qS(str) + " ");
 }
 
+void CompletionModel::addString(const QString &str)
+{
+    // Always add a space at the end of completions
+    this->emotes.push_back(str + " ");
+}
+
 CompletionModel *CompletionManager::createModel(const std::string &channelName)
 {
     auto it = this->models.find(channelName);
@@ -73,7 +90,7 @@ CompletionModel *CompletionManager::createModel(const std::string &channelName)
         return it->second;
     }
 
-    CompletionModel *ret = new CompletionModel(channelName);
+    CompletionModel *ret = new CompletionModel(qS(channelName));
     this->models[channelName] = ret;
 
     return ret;
diff --git a/src/completionmanager.hpp b/src/completionmanager.hpp
index 778b80706..e35c027be 100644
--- a/src/completionmanager.hpp
+++ b/src/completionmanager.hpp
@@ -11,7 +11,7 @@ namespace chatterino {
 class CompletionModel : public QAbstractListModel
 {
 public:
-    CompletionModel(const std::string &_channelName);
+    CompletionModel(const QString &_channelName);
 
     virtual int columnCount(const QModelIndex & /*parent*/) const override
     {
@@ -33,10 +33,11 @@ public:
 
 private:
     void addString(const std::string &str);
+    void addString(const QString &str);
 
     QVector<QString> emotes;
 
-    std::string channelName;
+    QString channelName;
 };
 
 class CompletionManager
diff --git a/src/logging/loggingchannel.cpp b/src/logging/loggingchannel.cpp
index b38deb6c3..d3fe1dd17 100644
--- a/src/logging/loggingchannel.cpp
+++ b/src/logging/loggingchannel.cpp
@@ -37,7 +37,7 @@ void Channel::append(std::shared_ptr<messages::Message> message)
     str.append('[');
     str.append(now.toString("HH:mm:ss"));
     str.append("] ");
-    str.append(message->getUserName());
+    str.append(message->username);
     str.append(": ");
     str.append(message->getContent());
     str.append('\n');
diff --git a/src/messages/message.cpp b/src/messages/message.cpp
index 0e675b1b4..d0b84f174 100644
--- a/src/messages/message.cpp
+++ b/src/messages/message.cpp
@@ -36,11 +36,6 @@ int Message::getTimeoutCount() const
     return this->timeoutCount;
 }
 
-const QString &Message::getUserName() const
-{
-    return this->userName;
-}
-
 const QString &Message::getDisplayName() const
 {
     return this->displayName;
diff --git a/src/messages/message.hpp b/src/messages/message.hpp
index cb49366f3..670ea744a 100644
--- a/src/messages/message.hpp
+++ b/src/messages/message.hpp
@@ -22,7 +22,6 @@ public:
     void setHighlight(bool value);
     const QString &getTimeoutUser() const;
     int getTimeoutCount() const;
-    const QString &getUserName() const;
     const QString &getDisplayName() const;
     const QString &getContent() const;
     const std::chrono::time_point<std::chrono::system_clock> &getParseTime() const;
@@ -30,6 +29,8 @@ public:
     bool isDisabled() const;
     const QString &getId() const;
 
+    QString username;
+
     const QString text;
     bool centered = false;
 
@@ -57,7 +58,6 @@ private:
     bool disabled = false;
     std::chrono::time_point<std::chrono::system_clock> parseTime;
 
-    QString userName = "";
     QString displayName = "";
     QString content;
     QString id = "";
diff --git a/src/messages/messagebuilder.hpp b/src/messages/messagebuilder.hpp
index adda6e0f5..ec61994f2 100644
--- a/src/messages/messagebuilder.hpp
+++ b/src/messages/messagebuilder.hpp
@@ -26,8 +26,10 @@ public:
 
     QString originalMessage;
 
-private:
+protected:
     std::shared_ptr<messages::Message> message;
+
+private:
     std::vector<Word> _words;
     bool highlight = false;
     std::chrono::time_point<std::chrono::system_clock> _parseTime;
diff --git a/src/twitch/twitchmessagebuilder.cpp b/src/twitch/twitchmessagebuilder.cpp
index a6e3b70d9..e028a8713 100644
--- a/src/twitch/twitchmessagebuilder.cpp
+++ b/src/twitch/twitchmessagebuilder.cpp
@@ -287,6 +287,8 @@ void TwitchMessageBuilder::parseUsername()
     if (this->userName.isEmpty()) {
         this->userName = this->tags.value(QLatin1String("login")).toString();
     }
+
+    this->message->username = this->userName;
 }
 
 void TwitchMessageBuilder::appendUsername()
diff --git a/src/util/helpers.hpp b/src/util/helpers.hpp
new file mode 100644
index 000000000..8435a3494
--- /dev/null
+++ b/src/util/helpers.hpp
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <fmt/format.h>
+
+namespace chatterino {
+
+template <typename... Args>
+auto fS(Args &&... args) -> decltype(fmt::format(std::forward<Args>(args)...))
+{
+    return fmt::format(std::forward<Args>(args)...);
+}
+
+}  // namespace chatterino
diff --git a/src/widgets/window.cpp b/src/widgets/window.cpp
index bbd805496..28859f3d3 100644
--- a/src/widgets/window.cpp
+++ b/src/widgets/window.cpp
@@ -6,23 +6,22 @@
 #include "widgets/settingsdialog.hpp"
 #include "widgets/split.hpp"
 
-#include <QDebug>
-#include <QLibrary>
 #include <QPalette>
 #include <QShortcut>
 #include <QVBoxLayout>
-#include <boost/foreach.hpp>
 
 namespace chatterino {
 namespace widgets {
 
-Window::Window(ChannelManager &_channelManager, ColorScheme &_colorScheme, bool _isMainWindow)
+Window::Window(const QString &_windowName, ChannelManager &_channelManager,
+               ColorScheme &_colorScheme, bool _isMainWindow)
     : BaseWidget(_colorScheme, nullptr)
+    , windowName(_windowName)
+    , windowGeometry(this->windowName.toStdString())
     , channelManager(_channelManager)
     , colorScheme(_colorScheme)
     , notebook(this->channelManager, this, _isMainWindow)
     , dpi(this->getDpiMultiplier())
-// , windowGeometry("/windows/0/geometry")
 {
     this->initAsWindow();
 
@@ -45,14 +44,7 @@ Window::Window(ChannelManager &_channelManager, ColorScheme &_colorScheme, bool
 
     this->refreshTheme();
 
-    if (/*this->windowGeometry->isFilled()*/ false) {
-        // Load geometry from settings file
-        // this->setGeometry(this->windowGeometry.getValueRef());
-    } else {
-        // Set default geometry
-        // Default position is in the middle of the current monitor or the primary monitor
-        this->resize(1280, 800);
-    }
+    this->loadGeometry();
 
     // Initialize program-wide hotkeys
     {
@@ -120,8 +112,12 @@ Notebook &Window::getNotebook()
 
 void Window::closeEvent(QCloseEvent *)
 {
-    // Save closing window position
-    // this->windowGeometry = this->geometry();
+    const QRect &geom = this->geometry();
+
+    this->windowGeometry.x = geom.x();
+    this->windowGeometry.y = geom.y();
+    this->windowGeometry.width = geom.width();
+    this->windowGeometry.height = geom.height();
 
     this->closed();
 }
@@ -133,5 +129,19 @@ void Window::refreshTheme()
     this->setPalette(palette);
 }
 
+void Window::loadGeometry()
+{
+    if (!this->windowGeometry.x.isDefaultValue() && !this->windowGeometry.y.isDefaultValue()) {
+        this->move(this->windowGeometry.x, this->windowGeometry.y);
+    }
+
+    if (!this->windowGeometry.width.isDefaultValue() &&
+        !this->windowGeometry.height.isDefaultValue()) {
+        this->resize(this->windowGeometry.width, this->windowGeometry.height);
+    } else {
+        this->resize(1280, 800);
+    }
+}
+
 }  // namespace widgets
 }  // namespace chatterino
diff --git a/src/widgets/window.hpp b/src/widgets/window.hpp
index a9c747e3e..4d5c7a76a 100644
--- a/src/widgets/window.hpp
+++ b/src/widgets/window.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "util/helpers.hpp"
 #include "widgets/basewidget.hpp"
 #include "widgets/notebook.hpp"
 #include "widgets/titlebar.hpp"
@@ -10,8 +11,7 @@
 
 #include <boost/property_tree/ptree.hpp>
 #include <boost/signals2.hpp>
-#include <pajlada/settings/serialize.hpp>
-#include <pajlada/settings/settingdata.hpp>
+#include <pajlada/settings/setting.hpp>
 
 namespace chatterino {
 
@@ -21,12 +21,32 @@ class CompletionManager;
 
 namespace widgets {
 
+struct WindowGeometry {
+    WindowGeometry(const std::string &key)
+        : x(fS("/windows/{}/geometry/x", key))
+        , y(fS("/windows/{}/geometry/y", key))
+        , width(fS("/windows/{}/geometry/width", key))
+        , height(fS("/windows/{}/geometry/height", key))
+    {
+    }
+
+    pajlada::Settings::Setting<int> x;
+    pajlada::Settings::Setting<int> y;
+    pajlada::Settings::Setting<int> width;
+    pajlada::Settings::Setting<int> height;
+};
+
 class Window : public BaseWidget
 {
     Q_OBJECT
 
+    QString windowName;
+
+    WindowGeometry windowGeometry;
+
 public:
-    explicit Window(ChannelManager &_channelManager, ColorScheme &_colorScheme, bool isMainWindow);
+    explicit Window(const QString &_windowName, ChannelManager &_channelManager,
+                    ColorScheme &_colorScheme, bool isMainWindow);
 
     void repaintVisibleChatWidgets(Channel *channel = nullptr);
 
@@ -48,6 +68,8 @@ private:
 
     virtual void refreshTheme() override;
 
+    void loadGeometry();
+
     ChannelManager &channelManager;
     ColorScheme &colorScheme;
 
@@ -55,92 +77,6 @@ private:
     bool loaded = false;
     TitleBar titleBar;
 
-    /*
-    class QRectWrapper : public pajlada::Settings::ISettingData, public QRect
-    {
-    public:
-        QRectWrapper()
-            : QRect(-1, -1, -1, -1)
-        {
-        }
-
-        pajlada::Signals::Signal<const QRectWrapper &> valueChanged;
-
-        const QRectWrapper &getValueRef() const
-        {
-            return *this;
-        }
-
-        virtual rapidjson::Value marshalInto(rapidjson::Document &d) override
-        {
-            using namespace pajlada::Settings;
-
-            rapidjson::Value obj(rapidjson::kObjectType);
-
-            auto _x = serializeToJSON<int>::serialize(this->x(), d.GetAllocator());
-            auto _y = serializeToJSON<int>::serialize(this->y(), d.GetAllocator());
-            auto _width = serializeToJSON<int>::serialize(this->width(), d.GetAllocator());
-            auto _height = serializeToJSON<int>::serialize(this->height(), d.GetAllocator());
-
-            obj.AddMember("x", _x, d.GetAllocator());
-            obj.AddMember("y", _y, d.GetAllocator());
-            obj.AddMember("width", _width, d.GetAllocator());
-            obj.AddMember("height", _height, d.GetAllocator());
-
-            return obj;
-        }
-
-        virtual bool unmarshalFrom(rapidjson::Document &document) override
-        {
-            using namespace pajlada::Settings;
-
-            auto vXp = this->getValueWithSuffix("/x", document);
-            auto vYp = this->getValueWithSuffix("/y", document);
-            auto vWidthp = this->getValueWithSuffix("/width", document);
-            auto vHeightp = this->getValueWithSuffix("/height", document);
-            if (vXp != nullptr) {
-                this->setX(deserializeJSON<int>::deserialize(*vXp));
-                this->filled = true;
-            }
-            if (vYp != nullptr) {
-                this->setY(deserializeJSON<int>::deserialize(*vYp));
-                this->filled = true;
-            }
-            if (vWidthp != nullptr) {
-                this->setWidth(deserializeJSON<int>::deserialize(*vWidthp));
-                this->filled = true;
-            }
-            if (vHeightp != nullptr) {
-                this->setHeight(deserializeJSON<int>::deserialize(*vHeightp));
-                this->filled = true;
-            }
-
-            return true;
-        }
-
-        virtual void registerDocument(rapidjson::Document &d) override
-        {
-            this->valueChanged.connect([this, &d](const auto &) {
-                this->marshalInto(d);  //
-            });
-        }
-
-        QRectWrapper &operator=(const QRect &rhs)
-        {
-            static_cast<QRect &>(*this) = rhs;
-
-            return *this;
-        }
-
-        void setValue(const QRect &rhs)
-        {
-            static_cast<QRect &>(*this) = rhs;
-        }
-    };
-    */
-
-    // pajlada::Settings::Setting<QRectWrapper> windowGeometry;
-
     friend class Notebook;
 };
 
diff --git a/src/windowmanager.cpp b/src/windowmanager.cpp
index 80cd9b4dc..bb3719d1e 100644
--- a/src/windowmanager.cpp
+++ b/src/windowmanager.cpp
@@ -22,7 +22,7 @@ WindowManager::WindowManager(ChannelManager &_channelManager, ColorScheme &_colo
 void WindowManager::initMainWindow()
 {
     this->selectedWindow = this->mainWindow =
-        new widgets::Window(this->channelManager, this->colorScheme, true);
+        new widgets::Window("main", this->channelManager, this->colorScheme, true);
 }
 
 static const std::string &getSettingsPath()
@@ -68,7 +68,7 @@ widgets::Window &WindowManager::getSelectedWindow()
 
 widgets::Window &WindowManager::createWindow()
 {
-    auto *window = new widgets::Window(this->channelManager, this->colorScheme, false);
+    auto *window = new widgets::Window("external", this->channelManager, this->colorScheme, false);
 
     window->loadDefaults();