Thanks for the answer! I know how to create widgets and put them into the viewport, but I’m having trouble migrating the logic from the ChatWindowActor (to open the input text and send messages etc.) to my character (casting problems in a different places, such as in the function SetupWidgetLinks). What procedure should I follow to achieve it? I’m kinda lost 
Edit: okay, I think I managed to get it working. I had to make my character inherit from the ChatEmitter interface, and that was almost it. I also have got a reference of my chatboxwidget (just added to the viewport) to link it with the messages.
Thanks!