Gatz

Gatz, known as Gaga (ガガ) in Japan, is the Servitor Unit for Mistress Yuna and protects her with his life. Gatz has a Reaverbot eye on his forehead and has the ability to transform into a large silver bird-like Reaverbot.

In Mega Man Legends 2, he uses this form to transport Yuna and attacks the Sulphur-Bottom as a warning to make them return, but accidentally damages the engines and trapps the Sulphur-Bottom in the storm of the Forbidden Island until Mega Man stopps it. After the four keys were stolen by Sera, he helps Mega Man fight against Geetz, but Geetz knocks him down. After Geetz's defeat, Gatz merges with a broken shuttle pod in Calbania Island to repair and use it to reach Elysium with Yuna and Mega Man. Gatz reveals he has reservations about destroying the System, but will follow Yuna no matter what happens. Gatz tries to help Mega Man against Sera by attempting to overload her logic circuits, but Sera discovers him and he dies by unknown means.