Tetsuya Kusakabe is extremely loyal to Hibari. Having been his right-hand man since over 10 years ago back when they were both in the Namimori Middle School Prefects. He has traveled around the globe with Hibari researching the Rings and Boxes.
Kusakabe is first seen in the lobby of the hospital, conversing with another prefect on the whereabouts of Hibari after Ryohei Sasagawa is attacked. However, it is revealed that as soon as he left the hospital; he was brutally beaten.
Kyoko Search & Gamma Battle
Kusakabe appears at the end of this plot point along with Hibari, as they were both traveling the globe to search for the origins of the Boxes. He affirmed that Yamamoto and Gokudera were going to survive the heavy injuries the two suffered as a result of their battle with Gamma. He assists in carrying the fallen Vongolas back to the hideout through Hibari's personal base, which is connected to the Vongola Base. Even offering to carry them both.
He does, however, assist in the debriefing. He takes Hibari's place, as he hates crowds. He begins by explaining that Kurokawa asked them to send Hibird out to search for Kyoko. He goes on to reveal that, Hibird included, the Vongola have over 10 different methods of backup communication. But the reason the SOS on the Hibird disappeared at the shrine was because of a faulty battery.
Tsuna is surprised to hear Kusakabe reveal that he and Hibari are still affiliated with their childhood Disciplinary Committee. But when Futa brings up the topic of their search for Box information, Kusakabe directs them to refer to Hibari for any more about that, as he intended on hanging around for a while.
Melone Base Invasion
Kusakabe brings reinforcements to the base after Hayato, Takeshi, and Ryohei have all already fought. Kusakabe is leading the backup team of himself, I-Pin, and the Lightning and Mist Guardians Lambo and Chrome. Their objective is to rescue Hayato and Ryohei from being captured by the enemy.
His reinforcements are later seen captured by the enemy along with the rest of Tsuna's family.
- His strength is later shown in the Melone Base Invasion Kusakabe was able to lift Adult Lal Mirch, Yamamoto, Gokudera, Chrome, and Future Ryohei on his back and still run at a considerable speed away from Hibari's out of control Box Weapon.
- In the Reborn! Fandom, his number is 93.
- Romario and Kusakabe seem to share a friendship, this is probably because Dino and Hibari constantly train with each other.
- He resemblance Ryunosuke Umemiya from Shaman King.
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