|“||Family... it's a foreign idea to robots, but I think Erich was like my father.||”|
Bugs is a playable character in the side story Xenosaga: Pied Piper. His nature is not specifically addressed in the game, but he appears to be a combat support robot - an older model that predates Realians. He is responsible for the party's armaments and is designed to provide support during combat in U.M.N. virtual space. His weapons include beams and missiles.
As for his personality, Bugs' AI was designed to emulate a small boy, and this is reflected in the childish way that he talks. He is quite attached to his caretaker and operator, Erich Weber, and when he believes Erich to be dead, he is devastated.
Overall, Bugs plays a small part in the storyline of the game, but he shares many poignant scenes with his operator, and in the end seems to be the only person that truly understands him. This is expressed by a suicide bombing during the final battle with Voyager.