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Reborn is an Arcobaleno and the holder of the Yellow pacifier of the Sun. The titular character, Reborn is an infant hitman belonging to the Vongola Family. As the Vongola IX's most trusted member, he becomes Tsuna's home tutor and trains him into becoming a Mafia boss.He often shoots Tsuna with special bullets that enhances his abilities. Since Reborn is not an official Vongola member and is only there to train Tsuna, he is not allowed to directly interfere with most of Tsuna's battles,though he is allowed to defend against attacks directed solely at him

Source from Wikipeida