American comics: Random transformations.

A small broken watch with a broken display icon.
Tian Xiaoban looked at the level 10 technological crystal of [Ben[-] Universe] on his left hand and felt very conflicted.
But when he transformed...
"Oh my god, how can they transform into Digimon and Pokémon? Uh, normal animals too?
Shit, what kind of weird DNA did this watch collect?
His transformation is like a lottery, whether or not a golden legend can appear depends entirely on luck.