Kendo Rappa/Relationships

Overhaul
Kendo Rappa met Overhaul for the first time when he appeared one day out of nowhere in the underground fight club. He wanted him to join Shie Hassaikai and challenged him. Kendo was not interested and fought against him, but he was easily defeated by Overhaul, so he had to join the Yakuza. Since then Kendo has challenged Kai five times and has lost to him five times.

Unlike the other seen members of the Eight Bullets, Kendo does not seem to fully respect Kai. This is shown when he openly declares his disdain for him after Overhaul forced him to partner with Hekiji based on their Quirks, and the reasoning behind it, preferring to fight on his own rather than rely on the "Spear and shield" plan they were given. He also does not refer to Overhaul properly, calling him "Overjerk" instead.

Kendo doesn’t care much for Overhaul's goals or ambitions, openly revealing them to Fat Gum, seemingly unconcerned with the repercussions for committing such an act.

Hekiji Tengai
Overhaul brought Hekiji into the Shie Hassaikai since his Barrier Quirk served to control Kendo's thirst for battle. Kendo does not appear to particularly like Hekiji, though he works with him out of necessity.

Clashing with his calm and calculative nature, Kendo dislikes Hekiji for attempting to restrain him when it comes to battling. He will even go as far as to attack Hekiji when he prevents him from getting a fight that he desires, or even when he tries to stop Kendo from displaying his own brand of honor.

Kendo Rappa didn't hesitate to step on Hekiji to knock him out when he wanted to help Fat Gum and Eijiro after his defeat.

Fat Gum
Kendo met Fat Gum when he was removed from the raid by Mimic along with Eijiro Kirishima. Kendo began to appreciate the hero when he challenged him to fight him without relying on Hekiji's barrier. Kendo is glad Fat Gum understands his desire for battle and accepts the challenge, encouraging him throughout the whole fight not to die too early against his attacks.

Although he and Hekiji were defeated by Fat Gum thanks to the intervention of Eijiro Kirishima, Kendo respects Fat Gum for his guts and tells him where there is an aid room to treat his wounds and Eijiro's. He was also very honest with him and told him everything he knows about Overhaul and his plans.

O'Clock
Years before Overhaul recruited him for the Shie Hassaikai, when he was still an independent underground fighter, Kendo met the hero O'Clock during the Underground Masquerade. O'Clock participated in the clandestine tournament under the alias of The Ripper to have the opportunity to expose their use of Quirk-related drugs. It was there where he took part in a match against Kendo Rappa, under the alias of The Rapper.

Kendo won the fight, taking the prize in cash, however he did not consider it a victory because his opponent did not have his full heart in the fight. Kendo went looking for The Ripper, discovering that, as he suspected, he faked a knockout. Despite this, Kendo gave him half of the winnings plus a bonus, considering that his victory did not count, and insisted they have a full fight-to-the-death rematch, but The Ripper declines. Kendo told him his personal beliefs, that "life's no fun without a little stupid, and that it's the soul that decides hate and love", recognizing that even if The Ripper didn't admit it, he deep down loves those kind of no holds barred encounters.

When All For One unleashed chaos at the event, the two would then work together, alongside Rumi Usagiyama, to escape the arena, with The Ripper revealed his identity as the hero O'Clock. Together they managed to escape danger. When the crisis was solved, the three parted ways, wishing good luck. O'Clock even showed concern for Kendo, asking him to take precautions, since those responsible for that incident could attack again.

Rumi Usagiyama
On the same day that he met O'Clock, Kendo also met Rumi Usagiyama, although at that time she was still not a pro hero but a hero in training. Rumi, under the alias Tiger Bunny, had infiltrated the Masked Underground and generated a great ruckus, having to be rescued by O'Clock to prevent her Quirk from being stolen, allying with him and Kendo to escape the chaos.

Initially, their first meeting didn't start off on the right foot, partly because Kendo considered women incapable of get his manly philosophy, and partly because soon after they met, they started to have an argument about whether "Kick Power" or "Punch Power" is most important in a fighter. Despite this, both did not hesitate to collaborate together in order to escape the Underground Masquerade, protecting each other, so they began to respect each other fighting skills. Kendo ended up impressed by the battle-hungry personality that Rumi displayed during the incident.

Eijiro Kirishima
Like Fat Gum, Kendo meets Eijiro during the Heroes’ raid on the hideout after Mimic separates him and Fat Gum from the main group. He manages to damage Eijiro's hardened state by blowing him into the wall with his punches. Before Kendo could land his finishing blows on Fat Gum, Eijiro used himself as a shield and withstood the attacks, leaving Kendo impressed by how he was still standing.

After he and his partner Hekiji are defeated by the BMI Hero, Kendo reveals that there are some first aid supplies in another room and tells him to heal Eijiro as he wanted to have another fight to the death with him, showcasing how much respect he has gained for the young hero for his unyielding resolve and dedication.