Daisy and Rosalina said:
They are more than this:
Bowser is evil
Wario is bad, greedy, gross
Luigi is a coward
Daisy is very very very loud
The thing is, everything that you said is just a generic personality that you could slap onto anyone and instantly create a character. These personality aspects are never explored, developed or anything of the sort since doing so would require story and character development, which is barely ever used in Mario games. That's what makes characters from movies/books/anime/whatever interesting. So while Mario characters have personality, it's never used to make them any more interesting than the initial impression from playing one round of Mario Kart with them. It's what they're designed for, they aren't meant to be deep characters.
The Mario RPGs do a little for characters like Bowser and Luigi, since those games are more story driven and can afford to do stuff like that to make the game interesting, but that's basically it for the main cast.