Hey you know what it could be cool for this campaign ?!
I mean since it's about writing beyond the box about characters, plot and so -This is just an idea and I mean no disrespect to anyone! -
A story about (whatever you want) and there's this really normal looking character that it simply is introvert, he helps the other characters when he can with things, but only when that doesn't require the introvert one to expose himself through a crowd or just anything too risky because he simply doesn't like that
And you know that cliché climax in the story where the nerdy guy and the introvert are asked to do something (that normally an introvert person would normally just never have to face because we simply like to avoid those troublesome and crowded places full of people) and then they are just like "No, I ain't going through this sh*t I don't even know you (name of the protagonist), I helped you a bit man but this is waaaay to far"... and you know what? IT'S COMPLETELY OKAY and they end up solving things their own way because let me tell you something BEING INTROVERT or NERDY or etc... it's NOT something you NEED to overcome, that's just plain you! and things can work their way to the end just by YOU doing what you're the best at and giving your piece of help
well that's just an idea... :'D
Also please forgive my English! :D