Flex Mentallo was once an average man until one day someone kicked sand in his face at a beach. This lead to him resolving to become stronger, so he read a book that taught him how to use the strange power known as Muscle Mystery. It succeeded, and he became strong enough to bend reality through sheer strength. Though he was originally a comic character who was fictional in-universe, a powerful psychic used their power to make Flex's existence a reality.
Powers and Stats
Tier: At least 5-B
Name: Flex Mentallo
Origin: DC Comics
Lifting Strength: Unknown
Striking Strength: Likely at least Planet Class
Durability: Likely at least Planet level
Stamina: Very high, flexed his muscles for two months straight without much tire.
Standard Equipment: None notable.
Weaknesses: Black Mentallium weakens him.