This is unironically what his reaction would be. Remember, prior to the game, Rex was just a simple salvager trying to make money for his family back at home. Even after basically saving the world, Rex would still feel amazed that there's a character in his likeness for heroes form around the multiverse.

Kinda like how Shovel Knight would be practically honored to be an assist trophy.

How about TWO costumes based on XC2?
(Nia is also a costume)

But yeah, it came out to late, I'm glad it got SOMETHING at least.
Two costumes (at the very least), Spirits, & music.