Adam Warlock

Known also as Him (for those who believe the theory of the MCU's Infinity Stones spelling out THANOS), Adam Warlock is the perfect human "“ literally, since he was created in a lab by the Enclave. As a testament to his strength, he is the one who turned Thanos to stone, thus ending the Mad Titan's conquest to impress Death.

And this is an unbelievable feat of strength.

As far as his powers are concerned, even without the soul gem, Adam Warlock is one of those remarkable superheroes who can manipulate cosmic energies for energy projection and flight. Whenever he feels the need, Warlock can enter a deep regenerative state, inside a cocoon.

His powers are greatly increased when he has the Soul Gem "“ and Warlock is basically known especially owning the Soul Gem. With its aid, he can trap the souls of others.

As a testament to his strength, we can say that he stood his own against the mighty Thor "“ though not enough to defeat the Asgardian, Warlock's strength is pretty impressive nonetheless. We can also mention that he is capable of interstellar fight, without any kind of aid.