Luka

Being of Planet Marius (マリウス Mariusu?), with the power to give her lifeforce to others, Luka (ルカ Ruka?, 42-43) was sent to Earth by Belzeus to unknowingly unseal the Bosquito, summoning Gig Fighters to hold the monster off until Tarius arrives. After seeing that the Gransazers were nothing like the Bosquito and Tarius resolve to protect the Earth, Luka questions her actions, and Tenma convinces her to leave Warp Monarch. However, in the end, Luka sacrfices herself to save Tenma's life.