Seike Taroumaru

Seike (清ヶ) is a character introduced in Toaru Kagaku no Accelerator. He is a powerful esper that can control the coefficient of friction and is a member of Scavenger.

Appearance
Seike is a boy that is very convincing in appearing as a girl. It is not until his confrontation with Misaka Mikoto that he confirms that he is a boy after assuming Mikoto was a boy as well due to her disguise.

Out of all the members of Scavenger, he is the one who has the most normal clothes, wearing a simple seifuku or sailor school uniform and a short skirt. He has long black hair and a bored or tired look in his eyes. By the time of his debut in Toaru Kagaku no Railgun later in the timeline, he is shown as being barefoot at all times.

On his tongue is a stylized tattoo or mark of a skull with horns and chains, which is apparently the symbol of Nakimoto Rizou.

Personality
He is much more low-key than his teammates, and as such doesn't speak much, befitting his bored appearance. Despite this, he can be still be quite mischievous as shown when he held out his tongue towards the DA operator of the Tarantula mecha and waved it, and even grinning and yawning when he stopped the machine.

Like all members of Scavenger, he does his job of killing people and destroying things without remorse or guilt, willing to eliminate those who get in the way. Moreover, he also hates teachers and believes them to be the source of evil in the city.

He uses the first person pronoun "ore" to refer to himself, which is often used by boys, an indication of his true sex.

Toaru Kagaku no Accelerator
When Nakimoto Rizou realizes that DA has become a liability he contacts Scavenger's liaison to have them eliminate the group. The liaison wakes them up and announces to them via an intercom that they have a job to do.

They are later seen again razing the entirety of DA's headquarters in Sector 3's warehouse district, apparently killing many people in the process. Despite this, some members of DA managed to get away from them. Seike notes to the other members that the place they destroyed is not the only target location. He comments that there is enough for everyone and asks if they saw the person carrying a bag big enough to carry a girl inside. They later track the surviving DA down using Leader's Predator ability.

Scavenger later comes upon a small contingent of Anti-Skill. Seeing Anti-Skill as in the way, they kill them as well, with Seike crushing a man's throat with his bare hands, as his group taunts the Anti-Skill still battling DA over the phone.

Scavenger later arrives at the height of Anti-Skill's battle with the remnants of the DA contingent that Scavenger hunted down. His first move is to destroy one of the Tarantula mecha's String Juicer discs. After an opening salvo of explosive paper airplanes on the Anti-Skill and DA by Naru, Seike and Leader are the ones to face off against the Tarantula mecha. Much to the Tarantula operator's horror, after Seike holds out his tongue, the operator realizes that they are Nakimoto's "cleaners". Enraged, the operator attacks them. Seike however simply uses his powers to prevent the mecha from moving, surprising the man. Seike hears and says that his power isn't Psychokinesis but the ability to control the coefficient of friction within a meter of himself. He states that the machine can't break a wall of air with the coefficient of friction set at max, and that any material that hit it will melt as the energy is converted to heat. After much urging from his comrade, the operator is forced to make a retreat away from them with his mecha.

As the Tarantula moves away, Leader takes a large magnum from her backpack and proceeds to toss it to Seike. He looks hesitantly at the weapon for a second before realizing what he is being told to do, but in the end reluctantly agrees. After briefly complaining about how using the weapon hurts, something that falls upon the deaf ears of his teammates, he fires the weapon and launches himself at an incredible speed, catching up to the Tarantula almost instantly. He then reduces the ground's coefficient of friction to zero, causing the vehicle to spiral out of control. After Estelle Rosenthal and Hitokawa Hasami save the falling Misaka 10046, Seike and the other members of Scavenger are shown standing on top of the Tarantula facing towards the duo.

Seike remains a spectator for Naru's fight with Yomikawa Aiho and Hasami, merely comforting Yakumaru when Leader chastises Yakumaru for not making sure to kill the Tarantula's pilot after freezing him with her coolant. Once Accelerator appears, Seike takes part in Scavenger's combination attack, being launched by Naru to remove the coefficient of friction around him so that he wouldn't be able to move. Like all the other Scavengers, Seike is terrified when Accelerator survives their attack, even more when they finally realize he's the #1 Level 5. Seike is the first Scavenger to be taken out by Accelerator, being slammed into the side of a truck and knocked out by Accelerator "playing" with his bioelectricity.

Dream Ranker Arc
Seike and the rest of Scavenger are sent on a mission to recover the cyborg doppelgänger of Kuriba Ryouko. He waits outside while the others stop at a public bathroom.

They go to the location where Leader saw the doppelgänger, but find that she has moved on. They find her in a street and Seike attacks her by using his power to send a truck and metal panels at her. He then kicks her down towards Naru and Yakumaru who then capture her. Leader notes that the doppelgänger had previously been with a similar-looking girl (the original Ryouko) and orders Seike to check it out. Seike complains but follows the order. He finds Ryouko and discovers that she's human, and is about to go when he is found by Misaka Mikoto.

Seike allows Ryouko to run away and then challenges Mikoto (who he initially thinks is a boy) to a fight. Seike's power allows him to deflect the thrown steel beams and to use them as grounds against electric attacks. He manages to knock Mikoto's hat off and closes in for the kill, but she escapes to the air. He realises that she's a girl and the #3 Level 5 just before she shocks him unconscious.

Leader manages to convince Mikoto to work with them against the doppelgänger, after which she orders Naru and Yakumaru to collect Seike.

Abilities
Seike's ability is to control the coefficient of friction within a meter of himself, like Amime, though obviously in a much higher level. When setting the friction of air at maximum, even a 120-ton mecha is unable to move through the "wall". Apparently, any attempt to move through this wall where the coefficient of friction is at maximum converts the energy of that attempt to heat. As such, if a bullet tries to move through the wall, it will only heat up and melt. Indeed, Seike boasts that any material on earth will melt first before passing through the wall.

He can turn all the kickback of a specialized magnum into thrust when he removes friction. This is enough to catch up to the Tarantula even after it was moving a considerable distance away, though he hates using the magnum as using it apparently hurts.

Seike's ability can only be used for three minutes in a row.

Also, it is unknown how, but he can also break a grown man's neck with his bare hands.