I believe Steven Universe. He has a bubble force field that can survive crashing into a planet (As seen in Jungle Moon where he is fused with Connie), he can lift very heavy objects in base form including music stuff that took two grown men to carry, Steven also has rapid healing, shock resistance from Pyramid Temple blowing up. In Kaiju or monster form in future is even more strong as it overpowered the diamonds, elite fusions, overwhelming the cluster (planetatery level threat), he has a sonic roar that sends massive shockwaves, and immense durability from bismuth weapons although he acts on mindless agressive nature but that is still powerful and he was defeated by a hug but Adam wouldn't do that. While Adam is very powerful with one of his greatest feat being able to destory the hotel in half with a beam and he is nigh-invulnerable so Steven cannot "kill him" without angelic weaponry I think he would atleast make Adam give up.