Biomon (App Monsters)

Biomon is one of the Ultimate 4 in the anime, and of Rei Katsura's Appmon in the manga.

Description
Biomon loves performing operations on others.

Anime
Bio is an Appmon who serves Leviathan. At some point, he rearranged Hajime Katsura's data on Leviathan's orders, and claims to have enjoyed this operation the most, as the result was "unbelievable". By spring 2017, Leviathan has chosen him to be one of the Ultimate 4 gathered to follow Knight Unryuji's orders.

Manga
Rei Katsura app fuses some of his Appmon into Biomon.