Amagiri Ayato (天霧 綾斗) is the main protagonist of Gakusen Toshi Asterisk. Ayato's main objective behind entering Seidoukan Academy is to find a purpose in life, though later the latter changes to fighting for Julis.
Ayato has both purple hair and eyes. On both sides, the front of his hair reaches just below his chin. In the middle of his face, his bangs droop between his eyes. His hair is almost symmetrical. He wears the traditional Seidoukan Academy uniform for males.
Ayato sports a friendly, polite, and helpful personality with a penchant for ending up in awkward situations. He is indiscriminate as to who he is being friendly to and is helpful to a fault, as well as being a bit naive. However, underneath the soft facade lies a person with an indomitable will who always tries to do the right thing, regardless of the potential trouble that he will get himself into.
Ayato's family runs a dojo that teaches ancient techniques by the name of the Amagiri Shinmeiryuu. He grew up with his father and half sister, though his relationship with the former became estranged when the latter disappeared. He also grew up as neighbors with Sasamiya Saya, who played a role as both his childhood friend and later, his sparring partner.
As a kid, he promised to protect his older sister and would even fight with people who would diss or doubt her. Haruka promised to protect him and even put a powerful chain seal on him, so he wouldn't fight with all of his power.
Amagiri Shinmeiryuu (天霧辰明流): Ayato uses the Amagiri Shinmeiryuu as his main method of attack while using his Ser-Veresta. Unlike Haruka, he has only mastered the sword and hand to hand techniques and is still in training with the others.
- Haruka's Seals: Before her disappearance, Haruka placed three seals on Ayato using her power as a Strega, all of which acted to seal Ayato's power until he unlocked it, preventing him from naturally using all power gained since then. He managed to break the first seal on his own, unlocked the second during his battle with Julis against the Li siblings, and was finally able to unlock the third during Team Enfield's battle against Team Lancelot after some training from Madiath the night before, getting rid of the seals completely. The first seal required him to figure out what he needed to do, the second seal required him to find friends that he could completely trust, and the third seal required him to surpass his sister in strength. According to Haruka, the reason she made the seals unlockable in three separate stages was so he would have at least the bare minimum if he ever needed to fight Madiath.
- Futatsumizuchi (貳蛟龍): Ayato slashes twice to create a cross-shaped slice.
- Shikibachi (肆祁蜂): Ayato moves around his target at lightning speed, then thrusts forward multiple times while his arm is stretched out and wrist is twisted.
- Fugaku (腑牙躯): Ayato curls his body and adds his weight onto a downward slash.
- Sajinrou (沙塵楼): Ayato swings his sword at the ground, creating a dust screen to blind his opponent.
- Tobiazami (十毘薊): Ayato holds his sword in his right hand, twists his body, then swings in a wide arc. Ayato then repeats in the other direction by switching the sword to his other hand.
- Kugatachi (九牙太刀): Ayato generates five thrusts and four different kinds of slashes.
- Yatagarasu (矢汰鳥): Ayato takes a deep breath and focuses his concentration. He imagines a small circle with himself at the center which he covers with his concentration, making the area perfectly defended. Yatagarasu is capable of defending against attacks that have a wide range, such as Irene's Diez Mil Fanega.
- Kurikara (刳裡殻): Ayato cuts his opponent in passing, then twists his wrist, stabbing his opponent to the ground as if to sew them to the ground. This move was used to destroy the Gravisheath.
- Soekibachi (貳鬼蜂): Ayato thrusts forward to entice his opponent to attack, then withdraws his sword, using the blade to knock his opponent's weapon up. He attacks again while his opponent is caught off guard.
- Rikutobachi (陸屠蜂): Ayato holds his sword level next to his mouth and thrusts at his opponent six times.
- Yamonjin (夜紋塵): Ayato grasps his weapon with both hands, then runs while twisting his whole body, cutting down his opponent in one strike.
- Chibashiri (千嘴離): Ayato swings his weapon at full strength as he draws it, using the momentum to twist his body and connect to his next strike.
- Gyakurasetsu (逆羅刹): Ayato controls the flow of power from several opponents to make them kill each other. This technique was originally known as Sakarasetsu until volume 7.
- Shurazuki (修羅月): Ayato moves in on his opponent and slashes at them in a half-moon arc. According to Ayato, Shurazuki is a technique designed to cut the opponent while running past them without stopping on the battlefield.
- Higabachi (罷牙蜂): Ayato thrusts his weapon forward, at the same time stepping forward while twisting his body, making it an advanced version of Shikibachi. One strike was powerful enough to shatter Kevin Holst's shield.
- Tsugomori (晦): Ayato closes his eyes, loosens his body, and shifts his center of balance to the base of his toes. By doing so, it helps his Shiki in sensing his opponent, such as their breathing, heartbeat, and muscle movement, bringing their every movement to the world of stillness. Then, keeping his eyes closed, he rushes at his opponent and strikes where he needs to strike. This move is said to not require speed and is likened to drifting in a dark river. It is also described as an extremely accurate counter to the origin of his opponent's movements.
- Narakumo (奈落蜘蛛): Ayato moves in on his opponent, then slashes right diagonally, horizontally to the right, twists his body and thrusts with his right, slashes left diagonally, horizontally to the left, twists his body and thrusts with his left, then thrusts with his right again for a total of seven strikes on the same spot.
- Mikumobachi (壬雲蜂): Ayato thrusts forward three times at high speed, making it seem like all three attacks come at the same time. It has enough force to blow away smoke.
- Shichinagi (士茅薙): Ayato holds a short sword in reverse, parries his opponent's attack, then uses the momentum to spin around and swing the short sword down at his opponent.
Hand to Hand
- Kuruwabarai (刳環祓): Ayato grabs the back of his opponent's collar, lifts them, flips them in midair, then slams them down onto the ground while he pounds his elbow into his opponent's chest. The force of the attack makes the opponent unable to breathe.
- Hitsubauchi (櫃羽穿): Ayato kicks upward with tremendous force while twisting his right foot.
- Fuwaguruma (不破轟): Ayato twists his body as he jumps, then kicks his opponent's face three times.
- Mushikuzushi (武姿崩): Ayato slides over to his opponent's chest, punches their weapon up to knock them off balance, then delivers a roundhouse kick to his opponent's pivot foot at full force.
- Mikazuchi (壬雷): Ayato punches the opponent's jaw with his right fist, elbows them in the chest at the same time, then punches their solar plexus with his left fist three times.
- Mikazuchi (壬卦槌): Ayato uses a special Mikazuchi by adding the offensive power of his prana onto it. The force from the strike can make the air tremble and create a small crater on the ground behind his opponent.
- Fusekazura (臥蔓): Ayato grasps the opponent's arm, then falls toward them while kicking their legs out. This technique is the origin of the Amagiri Shinmeiryuu Hand to Hand technique.
- Kugatsuchi (九牙鎚): Ayato breaks his opponent's arms, crushes their legs, then punches his opponent's liver, heart, spleen, lungs, and kidneys, with the last strike an elbow to his opponent to send them flying, for a total of nine strikes. Ayato was able to use it after temporarily unlocking the third seal.
Hand to Hand Sword
- Totsukami (砥柄壬): Ayato moves in on his opponent, slashes right diagonally, then turns his weapon around to land a hit to his opponent's stomach with the pommel.
- Shiki (識): Ayato expands his perception to the limit and gathers information on his opponents and surroundings using various sources such as movements, prana flow, sounds, and airflow. He was unable to use Shiki until he unlocked his second seal as his prana was constantly leaking. Using this, he is able to sense invisible things and predict where attacks will land.
Orga Lux: Ayato wields the Orga Lux Ser-Veresta that was formerly wielded by Haruka. He is periodically shown to feel the sentience of his weapon in his mind, especially its cry when it was damaged during his fight against Ernest. Originally, he was unable to change its size due to being bad at prana control, but was later given training by Haruka.
- Meteor Arts: Ayato couldn't use Meteor Arts before due to a normal Lux being unable to handle his vast prana, but having gained the Ser-Veresta, he became able to extend the length of its blade through channeling prana into it.
Genestellar (星脈世代): As a Genestellar, Ayato has enhanced physical ability and an aura known as prana.
- According to the author, Ayato's birthday is June 8th.
- His blood type is A
- Ayato calls out his attacks due to the promise he made with Saya when they were both children.
- Ayato cannot control his prana as he failed to decrease the size of Ser Veresta without the help of Julis. It was shown that Haruka placed seals on him because of his unstable prana so Ayato can learn to control it better.
- Of all the girls, even if Saya is his childhood friend, Julis is the one whom Ayato understands the most. He can tell if she is mad at him or if she is displeased on how he acted. He also makes sure to ask Julis first in case he needs to do something he is uncertain of. Julis is the one which Ayato has the absolute trust among the girls.