– Vongola insider
– Formally introduced in the Daily Life arc as weapons mechanic for Vongola (but not a very good one at the time).
– Inherited mechanical skills from Gianichi, his father. (He comes from a long line of mechanics.)
– Main technical support of the Vongola underground base in Japan in the Future arc (and a pretty good one by this time).
– Meek, very smart, and hardworking, but competitive when his skills are questioned