Sesera Sakurama

The Pink Keeper and commander of the Pink Battalion and Hibiki's older sister. She is obsessed with Hibiki.

When un-transformed, it is revealed she is crippled after getting caught up in Peltrola's battle, and has to rely on a wheelchair.

During the battle at the Monster Protection Society, she and Hibiki were both caught in an attack against a boss monster. Due to her controller dragon artifact she was able to save Hibiki's life by rewinding the damage on him, however the artifact is only able to rewind a single target so it came at the cost of her taking fatal injuries.
(Source: Wikipedia)