Sonic the Hedgehog
One night, while hanging out at the Piston Pit with some friends, the Roundhouse Thug noticed Sonic and Tom Wachowski. Annoyed by their presence, he angrily told them that he and his friends did not like hipsters, heavily implying that they should leave. However, Sonic responded by trying repeatedly to smash a bottle on the thug's head, only for it to have very little effect. Eventually, the thug lost his temper and attempted to punch Sonic, only for Sonic to dodge, causing the thug to hit Tom instead. The whole bar subsequently broke out into a riot, and the thug continued to try to fight Sonic. After Sonic attempted a series of harmless punches on the thug, the thug ran towards Sonic, who used his super speed to get out of the way and put a stuffed bear head over the thug's head, causing him to charge blindly through a window, injuring his neck.
The next morning at the Piston Pit, the thug was questioned about Sonic and Tom by two government agents, Dr. Robotnik and Agent Stone, but the thug refused to cooperate when Stone tried to question him. Robotnik then stepped in, making the thug attempt to intimidate him. Dr. Robotnik, however, soon got the information out of him and then threw him through a window.
The Roundhouse Thug is a very rude and aggressive man, tending to use intimidation to get what he wants. He is also quick to resort to violence and strongly dislikes hipsters.