Outside of his hero armor Tensei looks much like his younger brother Tenya, with square features and short black spiked hair. A differing feature is that he possesses arrow-shaped eyebrows and has a slightly longer face. Unlike Tenya, he does not wear glasses.
Similar to his brother, he has engine exhausts protruding from his body, but out of the ends of his elbows instead of his calves.
Compared to his younger brother, Tensei is far more laid back with an easy-going attitude. When he took up the hero mantle of his family, his image for himself was that he wanted to 'be cool' and be the type of hero that helps others when they are in need. He was joyful that his younger brother admired his work as a hero as a result.
He also believes that being able to rescue people quickly is what makes a great hero and that people want to be rescued in a hurry and value being saved quickly. He also values teamwork, believing that having a large group where everyone serves a specific purpose is the easiest way to rescue people quickly.
Although working as a Hero, he is lenient on laws. Unlike his younger brother, he doesn't scold others for using their quirk in public but instead helps them develop them. He also suggested the notion of taking on a sidekick who didn't have a Provisional Hero License, which is against the law, stating that he could 'earn his qualification little by little'.
Engine: His Quirk manifests in the form of engines in his elbows, allowing him to create blasts and shoot himself forward at turbo speed. He hovers a foot or so off the ground and relies on the propulsion from his arms to move at super speed, and has been seen using his Quirk to move faster than cars in a chase sequence. Unlike his brother Tenya, his Quirk does not seem to have gears and can hit max speeds in an instant; however, he finds it difficult to brake and turn while moving at top speeds and compensates by installing airbags in his Hero Costume.
- Recipro Burst (レシプロバースト Reshipuro Bāsuto?): By over-torquing his engines, Tensei is able to produce an explosive burst of speed. This also causes his engines to overheat.
- Rocket Charge (ロケットチャージ Roketto Chāji?): Tensei's hero costume increases and focuses his engines' output, affording him greater acceleration and launching him into the air, like a rocket. This causes his engines to stall.
Tensei has a strong bond with his younger brother, Tenya. When he was hospitalized at Hosu General Hospital, Tensei apologized to Tenya for being unable to be the role model that he looks up to. Tensei asked Tenya to take up his Hero name, Ingenium, indicating that Tensei has a great level of trust for Tenya.
Team Idaten is a professional hero agency operating under the turbo hero, Ingenium. Tensei places great pride and trust in his team, whom Tensei himself has claimed are "sworn, friends and teammates." Tensei's policy strongly advocates teamwork and communication, rather the class of quirk itself, allowing the team to welcome a wider range of abilities in comparison to other agencies. In the field, the team assists Tensei in various ways, including field agents, a reconnaissance team, a transport team, and even a control room with an operations team.
Tensei meets with Koichi during an early morning run. Tensei is impressed with Koichi's Quirk and offers him a place in his agency, even expressing a desire for a sidekick with a fast mobility quirk. Later, when Tensei discovers Koichi has been working as a vigilante hero, he withdraws his offer to Koichi, but only because he believes him to be already in the right place.
- His favorite things are sports and hayashi rice.
- (To Tenya Iida) "People who find a lost child and then take him to a lost-child center...I've always thought those sorts of people were the coolest."
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