Suggested by Anonymous Chewy is a tough guy who has some decent super strength and durability. Unfortunately for him it isn’t at a high enough level where it really matters here. Guyver is easily stronger than Chewbacca and has a lot of abilities up his sleeve to make this match even easier. A casual energy blast would probably be enough to end things here. Chewbacca has no real defense against that. Guyver wins.