Shuichi Iguchi/Synopsis

History
Due his lizard appareance, Shuichi Iguchi was a constant victim of racism. His early life was living among people who thought of him as a freak and doing anything about it was futile and was filled with nothing but emptiness. But after seeing Stain last stan on T.V., he was influenced by to Stain's ideology and his desire to change society to something better.

Vs. Hero Killer Arc
Three days after Stain's defeat, Spinner is seen smiling while putting on a mask similar to the Hero Killer's and brushing his hair back with his hands.

Forest Training Camp Arc
Spinner joins the other members of the Vanguard Action Squad as they look down at the camp where the students are staying. Later, once the invasion begins, he is seen grinning alongside Magne as Pixie-Bob lies on the ground, hurt and unconscious.

He then introduces himself and the other villains as the League of Villains' Vanguard Action Squad. Once Magne threatens to smash Pixie-Bob's face, Spinner tells Magne not to hurry and Tiger to calm down. He questions if Magne believes in Stain's ideals, and recognizes Tenya Iida as one of the people who brought about Stain's defeat. He then says his name and declares that he will be the one to make Stain's dream come true while revealing the enormous sword he had been carrying on his back. After Tiger reprimands him for scarring Pixie-Bob's face, he questions if heroes truly dream of finding ordinary happiness in life.

Spinner attacks Mandalay with his huge sword and she uses her Quirk to compliment him. The compliments make him blush and she is able to dodge his attack and scratch him with her cat gloves because of this. Spinner then insults her for using such a dirty trick on him. Before she can attack Spinner again, Magne uses her Quirk to pull Mandalay to her. Tora saves Mandalay and they start fighting each other.

While he is fighting Mandalay, his huge sword is destroyed by Izuku who used his Quirk to reach Mandalay as quickly as possible to tell her that Kota is okay. Mandalay continues to fight Spinner while Izuku starts to leave the battlefield. Magne, however, realizes that Izuku must be killed because he defeated Muscular; Magne starts to go after Izuku.

However, Magne cannot reach him because Spinner throws a knife between her and Izuku, thus stopping her from pursuing Izuku further. Magne scolds him for this action because Izuku is on the priority kill list of the Vanguard Action Squad. Spinner then clarifies that the list belongs to Tomura and tells Magne that Midoriya was the person that Stain saw fit to save thus being a man worthy of the title of a true hero. Mandalay uses this diversion to kick Spinner in the face.

Spinner is eventually overpowered and apprehended by Mandalay. Spinner curses the Pussycats and vows to fulfill Stain's mission. Kurogiri arrives and rescues Spinner and Magne, teleporting them back to the League of Villains' hideout.

Hideout Raid Arc
After Katsuki and the League of Villains watch a video clip of U.A.'s public apology, Tomura understands why society is criticizing U.A. for their failure and that is because the current Hero society is not just. Spinner agrees that the current Hero society isn’t just since the modern Heroes are only doing their job for compensation and not out of selflessness. Tomura explains that the League of Villains are fighting for a just society and intends to win this battle.

Tomura orders Dabi to remove Katsuki’s restraints, although Dabi is unsure since Katsuki might attack; Tomura wants to treat Katsuki as an equal and is aware that Katsuki knows he has no possibility of winning. Dabi has Twice remove the restrains. As Twice removes the restrains, Mr. Compress apologizes to Katsuki for forcibly kidnapping him and explains that the League of Villains are not just a group of hoodlums perpetuating crimes nor did they casually abduct him; he goes on by saying that everyone in the League of Villains is shackled by the current society and hopes that Katsuki understands their discrimination.

Katsuki’s restraints are removed. As Tomura approaches Katsuki, Katsuki attacks Tomura with his Explosions. Katsuki tells the League of Villains that it is pointless to try and make him change his mind as he has already been won over by the way All Might looks when he wins. Katsuki says that from the beginning he has dreamed of becoming a Hero and surpassing All Might and nothing they say will change that.

Suddenly, All Might breaks in with Kamui Woods swinging in and restrains Spinner along with the other League of Villains with his Lacquered Chains Prison.

Out of nowhere, Nomus appear from a mysterious black liquid which takes the Pro Heroes off guard. Spinner along with the League of Villains are teleported by the mysterious black liquid to the League of Villains' destroyed warehouse where Sensei is.

Sensei forcefully activates Kurogiri's Quirk which creates a portal for the League of Villains to escape through.

After Katsuki is rescued by Izuku, Tenya, and Eijiro, Mr. Compress along with Magne and Spinner hatch a plan to recapture Katsuki. Magne magnetizes Mr. Compress and Spinner pushes him, causing Mr. Compress to fly at Izuku’s group. Suddenly, Mt. Lady uses Titan Cliff and intercepts Mr. Compress, which causes them to smash into each other, preventing Mr. Compress from getting to the students. Magne and Spinner prepare to throw Twice, but Gran Torino blitzes them causing them to become unconscious.

The unconscious Spinner along with Tomura and the Vanguard Action Squad are forcefully magnetized by Magne's Quirk courtesy of Sensei; Spinner is sucked into Kurogiri's Warp Gate and teleported away.

Shie Hassaikai Arc
Following Overhaul's defeat, the League of Villains seek revenge against Yakuza boss and attack the police who are transporting him. Spinner is handling the driving with Tomura, Dabi, and Mr. Compress on board. Dabi tells Spinner to stop swerving and drive better to which the latter takes offense to saying that he learned how to drive from playing video games like.

Spinner then questions how attacking the police helps with creating a true hero society and whether they are actually following Stain's will. Tomura Shigaraki reassures Shuichi that it is a necessary sacrifice.

After Mr. Compress and Shigaraki take revenge on Overhaul and steal his Quirk Erasing Bullets, they leave the place.