It was shown again when Borin was talking with the Principal and one of the staff members, right after Kyoko took the assigning clipboard from Reborn so they could assign themselves to the class that they wanted to be placed in. While Reborn was talking, Haru's Father noticed Reborn's sideburns, he recognized Reborn as Professor Borin, a mathematical genius that can solve every single problem previously considered impossible to solve. When he can't solve the problem, Reborn said that there is an answer to that problem. When Tsuna's group had trouble on problem #7, Haru calls her dad for help. it was first seen during the Daily Life Arc. Professor Borine – Reborn's graduate costume.He also appeared in the anime during the Primo Family Arc while training Ryohei. Reborn appeared as Master PaoPao again on top of a hippo named Saizou when Tsuna and Kyoko were on their first date.
Master PaoPao – Master PaoPao is a Thai boxing elder.These are costumes that Reborn uses to assume alternate identities, complete with names and some kind of history. Rebokku - An outfit Reborn wears to host Mr. Also, every night, Reborn is seen with this pajamas to sleep in. Reborn sleeps at this time wearing this outfit, only waking to say a few words however, he later wakes up to give the correct answer, prompting Haru's father to identify Reborn as Doctor Borin, a prodigious infant mathematician. Reborn's pajamas – Reborn's pajamas are first seen when Tsuna and Yamamoto were having test problems and the Family ( Gokudera, Kyoko, Bianchi, and Haru) were trying to help them.It is a two-piece suit with a maroon long-sleeved shirt and blue necktie, black leather shoes with light gray soles, and a fedora with an orange strip. These are Reborn's usual outfits and clothes for special occasions, while still distinctly being himself.