Main article: Tsuna Sawada
Tsunayoshi Sawada (沢田 綱吉 Sawada Tsunayoshi?), referred to simply as "Tsuna" (ツナ?), is 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" (ダメツナ Dame Tsuna?) at his middle school, Namimori.He has a crush on Ryohei's sister Kyoko Sasagawa. 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. That state is what gradually makes others see him in a better light. For the most part of the series, Tsuna rejects his position and wants nothing to do with the Mafia, however, due to the results of various conflicts involving himself and his friends, his own power matures and he eventually starts embracing his destiny. He is voiced by Yukari Kokubun in the anime.
Reborn (リボーン Ribōn?) 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.His "partner" is a shape-shifting chameleon named Leon (レオン Reon?), who usually sits on Reborn's fedora. The bullets used by Reborn are created inside Leon. When Reborn's student is gradually progressing, Leon's tail falls off, his shape-shifting abilities become unstable, and he is no longer able to create bullets. After Leon creates special items for the student, he returns to normal.In the future, Reborn is mentioned to be dead, and in order to avoid the Negative Seven Rays which Byakuran unleashed in the atmosphere in order to slowly kill the Arcobaleno,the past's Reborn remains in Vongola's underground base and wears a special suit.
No matter how strong the emotion, Reborn always keeps a straight face and handles many situations as calmly as possible. Reborn often says "Ciaossu" (a mix of the Italian "ciao" and the Japanese "ossu", which is a casual male greeting). Later in the manga, this is revealed to be a mispronunciation of his real catchphrase, "chaos," developed because he was unable to pronounce the consonants of "chaos" in his baby form. He randomly appears dressed as "another person" who no one except Tsuna and Dino recognizes. He is normally voiced by Neeko in the anime but in his short appearances as an ãdül†, Ken Narita voices him