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 damaged the engines and trapped the Sulphur-Bottom in the storm of Forbidden Island until Mega Man stopped it. After the four keys where stolen by Sera, he helps Mega Man to fight against Geetz, but Geetz knocked him down. After Geetz's defeat, Gatz merged with a broken shuttle pod in Calbania Island to fix 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.