2. Molecule Man

Molecule Man AKA Owen Reece – particularly the version before he was retconned (which we’ll be largely focusing on here) – doesn’t have any baseline super-strength to speak of, but he is one of the most powerful beings in all of Marvel and could defeat the Hulk with utter ease.
He has the power to mentally alter matter on a scale that transcends universes. This extends to being able to manipulate the molecules in his own body – which makes him practically unkillable – but also gives him incredible offensive power.

Such is the level of his power that he can essentially utilise it as telekinetic super-strength – displaying the ability to lift mountains and reshape buildings.
However, it is his transmutation powers that make him so dangerous. He can create adamantium from nothing, turn opponents to glass, use dust in the air as a highly-dangerous offensive weapon, create massive impenetrable force-fields and destroy (and recreate) items as powerful and iconic as Mjolnir, Captain America’s shield, Iron Man’s armour and Silver Surfer’s board with consummate ease.
Basically, the entire environment is a potential weapon for his use and he could casually turn the Hulk into a pebble if he wanted to.
He has also shown the ability to take over other people (see above picture) and use his power through them.
