Possible Boba Fett Matchups:
-Starlord
-Predator
-Master Chief
I don't want more capeshit
Master Chief has Doomslayer which while a stomp have too many similarities (Both are unrelenting badass space marines who fight legions of demons/aliens, was genetically enhanced by an ancient divine race [Makyrs and Forerunners], have their own AI companions [Vega and Cortana/The Weapon], both command respect and terror in the hearts of their foes, and both are deep down broken and traumatized individuals hardened by tragedy and bloodshed into killing machines)
Predator also has more google search results than Starlord, so that's a plus. I just htink Boba vs Preds would be coolest.