Fin, Jake, and Marceline of Adventure Time take on Garnet, Amethyst, and Pearl of Steven Universe
Fin, Jake, and Marceline of Adventure Time take on Garnet, Amethyst, and Pearl of Steven Universe
Having not seen that much Adventure Time, I'm left with the impression that Finn is the weak link here. Pearl should take him just fine. Jake is more impressive with the shape shifting, but Amethyst and Garnet are also solid shape shifters with brick stats and other powers to boot.
Marceline is the wild card for me.i recall her displaying a lot of terrifying powers, but don't recall much to establish how they translate to combat.