Bargo
Rattata
while he doesn't explain the full backstory, Sakurai brings up an interesting tidbit about how Street Fighter 2 handled sprite flipping by ensuring each character was perfectly symmetrical. noting how Dee Jay's pants are labeled with the word "MAXIMUM" due to it looking the same when rotated.
his character designer, James Goddard, notably explained in an interview that his original design featured the word "MANTIS". which was changed as the N and S would appear flipped whenever he turned around.
And the Maxim Tomato has a similar origin.
Kinda makes me think that "Super Smash Bros. Maximum" wouldn't be a bad title for the next Smash, if they were to keep building on Ultimate.