Kiriko Kiyuna

She is a high school student and the original pilot of the type 2 Daimidaler who took a leave of absence after losing her Hi-ERO powers in her initial battle with a penguin mech.

She now pilots the type 6 and is now in a relationship with Shouma. This relationship with him helps her to elevate her "Hi-ERO" particles.

(Source: Anilinkz)