Apology for double posting.
@Shortiecanbrawl: Late response, but while Toad does fall for not having strong roles, I was referring to importance of Toad in the series and despite the usually small role, Toad is an important and integrated part of the Super Mario Bros. series that can't be remove.
As for your criteria, I think Victini fits in #2, #3, and #4. As for #1, I have no idea how this would apply to a Pokemon, but I guess he works there as well (he does after all have two movies behind his belt, is 000# on the Unova Pokedex, and is on a Pokemon Center Logo.