so Mouse Man is too goofy but Blue Snowman is ok? I'm confused by comic book logic sometimes.
T'Challa
A.K.A. The Black Panther
King of Wakanda
King of the Dead and The Champion of Bast
Two-Time Time Magazine "Person Of The Year"
Six-Time People Magazine "Sexiest Man Alive"
Honestly the real trick to making Mouse Man work is how to differentiate him from other villains with similar themes.
Putting aside the hero Mouse whose able to control mice, and Mouse the computer hacker with a trained rodent. There is still French Mouse whose a master thief who works with 'cat', Ratcatcher a Batman villain who can control rats, Rat-Tail with the power of having an awful haircut, and Black Rat who was a villain that ran around in a rat costume.
The one thing that makes him stand out is that he happens to be the only one whose actually the size of a rat. Maybe more can be done with that?