@JGoldman10,
Then you really haven't paid any attention to pop culture or animation history in general in the last 30 years. Which is odd as you went to art school in the 1990s, during Disney's Renaissance era of films, in a major metropolitan area.
As stated in the other discussion, Waluigi is just a minor video game character with no backstory, only appears in multiplayer games, while still having a vocal but small fanbase.
Meanwhile, Elsa from Frozen has been the main character of two films, two shorts, a Broadway show, and heavily featured in Disney merchandise.