Cosmo

From Sonic Retro

Cosmo is a plant-like character who first made her appearance in episode 53 of the cartoon Sonic X. Her home world was apparently destroyed by the Metarex, who planted a tracking device on her. She appears to have a role similar to Cream the Rabbit's, always getting captured and used as a shield by Dr. Eggman. She is killed at the end of episode 78 in Sonic X.