Tensei Ida

Put him beside Tenya and the family resemblance lands immediately: the same squared-off features, the same short spiked hair, black in the manga and dark blue on screen. The differences are small. Tensei's face runs a little longer, his eyebrows come to arrow points, and he wears no glasses.

His Quirk marks his body the way his brother's does, except the exhaust ports open at the ends of his elbows rather than his calves, and they are gold where Tenya's are silver.

Some time after the Final War he is upright again, using advanced prosthetics that fit over his shins on the outside of his clothing.

Where his brother is rigid, Tensei is relaxed. When he took up the family's hero mantle, the goal he set himself was simply to be cool, meaning the sort of person who turns up when somebody needs a hand, and he was delighted that Tenya admired the result.

His whole philosophy reduces to speed of rescue. He holds that people in trouble measure a hero by how fast the help arrives, and that the surest way to reach them quickly is a large team where every member has a defined job. He once told his brother that the coolest people he knew were the ones who found a lost child and walked them to the lost-child center.

He also bends rules his brother would enforce. Public Quirk use earns no lecture from him; he would rather coach the user. He even floated hiring a sidekick who held no Provisional Hero License, illegal on its face, reasoning that the qualification could be earned along the way.

Before the injury, Tensei ranked well above the average Pro. His method previewed the one Tenya would inherit, using Engine to launch himself into kicks with real momentum behind them, and his endurance let him trade blows with villains whose raw power exceeded his own.

Engine gives him motors in his arms rather than his legs, firing propulsion jets from the elbows that shove him forward at turbo speed. Grapefruit juice is the fuel, where Tenya runs on orange. He hovers slightly off the ground and lets his arms do the driving, outrunning cars in a chase. His version has no gears at all and hits full speed the instant he calls on it, and the tradeoff is that stopping and cornering at that velocity is genuinely hard, which is why airbags were built into his costume. Over-torquing the motors produces Recipro Burst, an explosive surge that overheats them, while Rocket Charge lets the costume concentrate their output into a launch skyward and stalls them afterward.

His long-running duel with Batto Yobayakawa runs three rounds and he loses all three. The bat villain outran him on the Naruhata highway and put him into a wall. In the rematch Tensei stripped the airbags out to shed weight, matched him, and nearly had him beaten until the villain took to the air. Their last meeting came after Batto was remade into a Next-Level Villain, faster than ever, and Captain Celebrity had to finish what Tensei could not.

Thinking his way toward an answer is what defines him. He worked out that Batto paired the darkness overhead with a Bat Quirk to stay elusive, that Naruhata's tangled streets cost him more than they cost his target, and that a bus fused with the Monster Cat was far too large to stop by force. He timed the creature's speed instead and handed his team a five-minute window before it ran out of road. He talked frightened commuters calm, had Team Idaten match the thing's pace for a transfer, vouched for his rookie Enigma in front of the passengers, and told Koichi Haimawari to stay behind him and skip the fighting. His advice fixed Koichi's Quirk outright: rather than trying to stop, imagine accelerating backward, and the momentum problem dissolves.

The last job he took as a Pro was hunting the Hero Killer, a man with seventeen dead heroes and twenty-three crippled ones behind him. Tensei knew the record and went anyway, and he lasted a while. He did not win. Stain left him paraplegic, victim number twenty-four, and the final hero the Killer would ever put down.