A strong and mostly stoic character, Kenshiro is compelled to punish evil-doers and can perform feats not possible for most people. His mastery of the ancient martial art Hokuto Shinken allows him to kill or cripple with a mere touch. The results tend to be very messy -it usually causes parts of the victim to explode- but the art also includes several other means of killing. He can also use this art to heal or to alter people's behavior.
When angry his spiritual powers reach their peak, normally culminating in the dramatic destruction of his shirt and jacket (which, despite the obvious lack of a wardrobe or clothing store, are always replaced in the next episode or story arc) to expose his muscular torso.
His catchphrase is Omae wa mō shindeiru (おまえはもう死んでいる), meaning "You are already dead", which he usually says before a villain's head is about to explode.

Accelerator is the most powerful Psychic in Academy City. His real name is unknown, though Accelerator recalls his surname was composed of two characters and his given name consisted of three characters. First appearing as an antagonist of the third light novel, he later becomes a main character and the lead of the science side in the Toaru Majutsu no Index series.
A sadistic boy about the same age as Tōma, he has an ability called "Vector Change", a form of telekinesis allowing him to change the vector values of anything he touches due in part of having a thin coat of AIM fields surrounding his body. This ability allows Accelerator perform feats such as reversing the blood flow inside a person's body, increasing the wind velocity around him to create a massive plasma storm, and blocking sound. His ability is automatic, which means that he must consciously allow gravity to affect him and that his body blocks all ultraviolet radiation, resulting his albino appearance (white hair and pale skin) because his body is unable to make melanin. The automatic nature of Redirection also prevents the use of projectiles (like bullets) and explosives (like bombs) against him.