I once was attempting to write a fanfic about how Wario met all his friends from WarioWare. In it, Wario accidentally helps all these troubled souls and earns their friendship, whether he likes it or not. It's similar to how in the Wario Land games Wario accidentally saves the day when all he cared about was getting treasure.
Each chapter focused on a different character. For example, in the first chapter Wario discovers there is a big prize money for winning a dance competition at Club Sugar. Not wanting to turn down a chance to make money, he enters it. There's one problem, this guy named Jimmy T who is sure to win. Wario decides to cheat by finding Jimmy's secret weakness. It turns out Jimmy was hiding his love of dance from his family because he was afraid they wouldn't approve. Being the asshole that he is, Wario invited Jimmy's family to watch the competition, knowing that it will ruin Jimmy.
However, something unexpected happened. Jimmy's family cheered him on! With tears in his eyes, Jimmy danced like he never danced before and won.
Jimmy and his family were now closer than ever and it was all thanks to Wario! Jimmy swore to be Wario's close friend from that day forward.