Marugori

Beefcake (マルゴリ Marugori) was a regular human until he drank the Biceps Brachii King steroid from his older brother, Oldface, which turned him into a mutated giant.

Appearance
As a human, Beefcake was depicted as a buff young man, with a large torso and muscular arms. He had very sharp eyes and a shaved head. It seemed that he preferred wearing tank tops and plain jeans. These clothes were ripped off when he transformed into a Mysterious Being. When transforming, his veins were popping, muscles expanding and his size grew incredibly. As a giant, he resembled a typical giant from Shinkgeki no Kyōjin, steaming, with a white, bone-like armor covering his enormous muscles. Most of his skeleton and muscle tissue became visible, including his tendons. He also grew two tubes, protruding from his chest and running over his shoulders to his back.

Introduction Arc
Beefcake is first seen in his brother, Oldface's lab. He is handed the ultimate steroid, Biceps Brachii King and drinks it, being told that it will give him the power he always wanted. Beefcake yells out in pain and his body grows in size in a rapid rate. It doesn't take long before he bursts through the lab's ceiling and transforms into a severely mutated giant. He picks up his brother, puts him on his shoulder and marches for the nearby city, D-City. Arriving at the city, he think by himself that he always dreamt of becoming the world's strongest man. He swings his arm and crushes a few buildings. His brother is ecstatic about his overwhelming strength and the brothers move on to the next city.