No character has ever been more deserving of ridiculous fancification than Ultros. He's a stupid purple octopus in a game about technology destroying and re-creating the world! He's cheap comic relief! He gets demoted from mini-boss to a *receptionist*. He is failure personified.
And that is why this must be done.
(as a double extra bonus, there actually is a canon Amano illustration of Ultros. It is not ridiculously fancy. It looks like a stupid purple octopus.)