Grimer

Grimer is a cannibal, robber, bodyguard, and murderer. He serves as the main antagonist of the Grimer Arc in Jump-Strike and a supporting character in Glimmering Speeds. At the climax of the Grimer Arc, he realizes his faults and turns himself in to the police. He then supports Supina to find Akitsaigai in Glimmering Speeds. Grimer dies in Saki City at the end of the Jump-Strike/Striking storyline, and is remembered for how he turned his life around. He even has a high school named after him, Grimer High School.

Abilities
Complete Sound Control: Grimer has the ability to control sound. This let's him completely control sound and have abilities relating to Sound Control. Complete Sound Control also lets him go Sound Speeds.

220 Decibels: Grimer snaps and instantaneously, the sound makes his opponent cough blood and instantly knock out. This is Grimer's strongest attack, as it instantly knocks out his opponents with one snap.

Pistol: Sound Bullets: Grimer flicks his fingers, intensifying the sound waves and creating bullets out of sound. These bullets move at sound speeds.

Breaching Fist: Grimer moves at sound speeds to quickly punch his opponent.

Sound Illusions: By controlling sound, Grimer can put his opponents into illusions if they can hear the sound waves.

Backstory
In the two part backstory chapter, it's revealed Grimer was heavily bullied. Kids beat him up, saying he wouldn't be anything in life and even threatened to hurt him with their powers.

10 years later, Grimer and Aruba have become thieves. They are shown in a car chase, as police officers Doris and Nezumi chase after Grimer and Aruba. When the two are about to arrest Grimer and Aruba, Grimer is suddenly pulled away to Manali Riji's base. There, he is negotiated to guard Manali due to his interesting power. They ask if he wants to become a vampire, to which he quickly declines. Afterwards, he agrees to help them as long as he doesn't turn into a vampire.

Nezumi and Doris are fired, and go to Grimer and Aruba for mercy. They all make a group. Later, the police kill and arrest 59 of their members.

Trivia

 * Grimer is Jokese's favorite character in the series, which is why he let Grimer turn good and not be defeated.