Don't worry. I'm just hijacking your body. Calm down. It'll only hurt for about 45 seconds... then it'll be all over.The Sludge Villain while trying to possess Izuku Midoriya.
The Sludge Villain is a minor yet significant antagonist in the manga/anime series My Hero Academia, he is an unnamed robber and criminal with a Quirk that gives him a mud-like body.
He is one of the first villains seen in the series, as well as the villain who begins Izuku Midoriya's story of meeting his idol and the Symbol of Peace, All Might, a meeting that would begin the young man's journey to becoming a hero.
He was voiced by Shinya Fukumatsu in the Japanese version of the anime and Jeremy Inman in the English version.
From what was seen of him, the Sludge Villain was a cruel and sadistic criminal who was willing to commit a bank robbery in broad daylight with bystanders present. At the same time, he was willing to sadistically possess the bodies of Izuku Midoriya and Katsuki Bakugo in order to escape being caught, something that would've suffocated both teenagers to death. He shows his sadism in taunting Midoriya over unwillingly helping him to escape and was also willing to use Bakugo's Explosion Quirk to wreak havoc on the city before finally being caught.
Entrance Exam Arc
The Sludge Villain is first seen robbing a bank and fleeing the scene, he is soon spotted by All Might who gives chase to the villain. The Sludge Villain is forced to evade him and escapes through the sewers.
Later on, the Sludge Villain reappears behind Izuku Midoriya as the latter is determined to keep chasing his dream of becoming a hero despite being Quirkless. The Sludge Villain pounces on Midoriya, planning to use him as a "skinsuit" to escape the city. He proceeds to taunt the boy and nearly kills him in the process of taking over his body. However, Midoriya is saved by the timely arrival of All Might who uses his Texas Smash to blow the Sludge Villain apart and trap him in two soda bottles.
All Might wakes Izuku up, discreetly signs his notebook, and quickly leaps off planning to deliver the Sludge Villain to the police. However, Midoriya ends up clinging onto his idol in an attempt to get him to stay, during the skirmish, All Might drops the bottles and the Sludge Villain escapes capture once more.
The Sludge Villain then comes across Katsuki Bakugo and takes over his body in favour of using the boy's Explosion Quirk. The villain then takes Bakugo's body around the city and uses his Quirk to cause destruction, while the Pro Heroes are unable to detain the Sludge Villain. Upon seeing Bakugo in a state of fear and danger, Izuku instinctively rushes forward to help save his friend even in spite of the danger posed to himself. The Sludge Villain nearly attacks Midoriya but All Might appears again and defeats the Sludge Villain with Detroit Smash.
While Bakugo is freed and Midoriya is chastised by the Pros for recklessly endangering himself, the Sludge Villain is finally arrested and taken into custody by the police.
Despite being a petty and minor villain, the Sludge Villain's actions would set up a chain of events that would begin Izuku Midoriya's dream of becoming a hero by rigorously training his body to inherit All Might's secret Quirk: One For All. Which in turn, started the entire series as we know it.
Unnamed Sludge Quirk: The Sludge Villain's Quirk granted him a malleable, mud-like body which made him very resilient against physical attacks. His Quirk allowed him to shapeshift to some degree, allowing him to squirm up through a sewer grate. In addition to this, the Sludge Villain could also use this power to possess other people and use their Quirks against their will.