Michael Smith

Michael Smith, also known by his hero name Knuckle, is the main antagonist of Union Kingdom. He was originally a prominent hero, ranking in the Top 5 in the United Kingdom and temporarily ranking as the No. 1 hero. However, his plan was eventually uncovered to be sabotaging and destroying all heroes above him to achieve a dictatorship over the country. Once he was defeated, he was arrested and stripped of his hero title and license.

Personality
At first, Michael was shown to be a quiet, calm and serious guy, but with a good heart and dedicated to helping people when possible. It was eventually revealed that this was all an act, and he's actually pursuing a dictatorship, wanting to become the No. 1 hero by destroying all heroes above him and using villains to achieve this.

Quirk
Beefcake: At any point, Michael can beef up in size, increasing his muscle mass and heightening his abilities. This form gifts him with increased strength, speed, durability and even improves his senses, allowing him to see further and hear with more accuracy.