Longchamp is the energetic and overly enthusiastic eighth-generation Tomaso boss-in-training. He attends the same school as Tsuna, but they first meet in their second year when Longchamp ends up in the same class. Unlike Tsuna, Longchamp is optimistic and excited about everything, including his involvement in the Mafia. Despite their families being rivals, he constantly tries to befriend Tsuna, even inviting him to his house and going on group dates together. Longchamp has a unique taste in women and often has a new girlfriend every time Tsuna meets him. Some of these girls seem to dislike him intensely.
Naito has a tattoo on his chest that reads "De Tomaso," the full surname of the Tomaso Family. He also has an odd habit of collecting unusual items, such as dead batteries and condiment packets, which results in his bedroom being cluttered with junk due to his hoarding tendencies.
