Cosmo the Seedrian

Cosmo is one of the main characters of Sonic the Hedgehog series. She is a female child of a plant-like alien species whose homeworld was destroyed by the villainous Metarex and she is the only surviving member of her species. She is an current ally of Sonic and his friends, as well as a love interest for Miles "Tails" Prower.

Following the events of Sonic Adventure 3, Cosmo makes a debut return on Sonic Party Adventure. She returns to life and joins Sonic and his friends for ongoing battle with Dr. Eggman