After the X-Men Liberty Island incident, Roy traveled to the Marvel Universe and obtained the Fish-Fish Fruit, Mythical Beast, Azure Dragon Form at the beginning.

Iceman: I can create low temperatures and freeze everything! Roy: I can too!

Fireman: I can control fire and burn everything! Roy: I can too!

Storm: I can summon lightning and control hurricanes! Roy: I can too!

Dr. Banner: I can transform into the Hulk! Roy: I can turn into a Azure Dragon!

…

This is a story about a Devil Fruit user who can do whatever he wants in the Marvel world.