EVE is a robot created by Ninten's grandfather, George, to act as his guardian. She waited deep under a lake on Mt. Itoi, awaiting the boy. When Ninten found her, she happily joined his party and procceeded to save them from drowning in the crumbling base.
From here, she demonstrated her enormous power as she could easily destroy any enemy that came across the gang. With up to 1000 damage per attack, she was incredibly powerful. However, she was defeated in combat by an opposing robot sent by Giegue to assinate Ninten. By selfdestructing, she gave her own life for Ninten's and destroyed the robot in the process.
She is now alive again, but certainly not in good shape..maybe an intellectual inventor could bring her back to her old strength?