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Character:

The 14-year-old central character of the series. Because of his severely low self-esteem and lack of talent in any activity, Tsuna is known as "No-Good Tsuna" at his middle school Namimori. After being informed that he is the heir to the Vongola Family, due in part to him being the great-great-great grandson of the first Vongola boss as well as the untimely deaths of the other candidates for the position, he is trained into becoming a mob-boss by the infant Vongola hitman Reborn.Tsuna is often shot by Reborn with a bullet that increases his physical abilities in order for him to fulfill his regrets.

Source from Wikipeida