Reborn

Reborn is the eponymous character of the Katekyo Hitman Reborn! series, who showed up one day to train Tsunayoshi Sawada to be the next boss of the Vongola Famiglia. As Tsuna's tutor he is a central presence across the Reborn manga and the anime adaption. Additionally Reborn cannot be missed in the series' video games, drama CDs, and promotional materials.