Use async DB queries.

Content.Client/UserInterface/CharacterSetupGui.cs

@@ -136,7 +136,6 @@ namespace Content.Client.UserInterface
             _createNewCharacterButton = new Button
             {
                 Text = "Create new slot...",
-                ToolTip = $"A maximum of {preferencesManager.Settings.MaxCharacterSlots} characters are allowed."
             };
             _createNewCharacterButton.OnPressed += args =>
             {
@@ -155,6 +154,8 @@ namespace Content.Client.UserInterface
             hBox.AddChild(_humanoidProfileEditor);
 
             UpdateUI();
+
+            preferencesManager.OnServerDataLoaded += UpdateUI;
         }
 
         public void Save() => _humanoidProfileEditor.Save();
@@ -164,6 +165,15 @@ namespace Content.Client.UserInterface
             var numberOfFullSlots = 0;
             var characterButtonsGroup = new ButtonGroup();
             _charactersVBox.RemoveAllChildren();
+
+            if (!_preferencesManager.ServerDataLoaded)
+            {
+                return;
+            }
+
+            _createNewCharacterButton.ToolTip =
+                $"A maximum of {_preferencesManager.Settings.MaxCharacterSlots} characters are allowed.";
+
             var characterIndex = 0;
             foreach (var character in _preferencesManager.Preferences.Characters)
             {