He is an odd little boy who starts with a Porygon who followed him from the labs where he was raised. It evolves as he grows older, helping him survive on the streets until he's picked up by Lancia. Lancia gifts him an Eevee, telling him that it will grow into whatever he wants it to be.

Before heading to one of the other regions, he picks up a Meditite, Seviper, and Zorua. TYL Tsuna gifts him an Oddish, telling him to raise it. Mukuro tries to get rid of it but it refuses to leave him.

Pokemon team: Porygon, Eevee, Meditite, Seviper, Zorua, Oddish
(Later: Polygon Z, (???), Medicham, Seviper, Zoroark, Vileplume)