There isn't really a great mechanic for learning skills and languages in dungeons and dragons. This makes it a bit lacking if there is a certain amount of off-time between adventures and missions. It would be cool to think some sort of mundane dnd. Like mini-games in video game RPGs that make your character a little bit more personal. A quirks mechanic, that adds a certain way your character acts in the every day or what your character normally does. The risk is that it could turn into too much of a dice roller and the players might engage less with the story. What do you think?