Eri

Eri seems to serve as a "big sister" figure of Team Star. When Team Star was created one year and a half prior to the beginning of the player character's journey, she helped the other bosses train their Pokémon and acted as a mediator when arguments broke out. Eri is an athlete, and her diligence and experience with personal discipline helps her to lead Team Star's training regimen. She is willing to fight and risk her safety in order to protect her friends. On the outside Eri appears aggressive and hardcore, but deep down she means no harm.

however, that doesn't mean she WON'T take action in punishment.

(she is a Tsundere to you, bc you are seen as an enemy within Team Star... but she'll warm up to you..... if ever)