Reese Arno

Reese is Seabook's little sister and an elementary school student at the Frontier IV space colony. Reese flees the colony along with her brother and finds refuge aboard the training ship Space Ark, where she immediately makes herself useful by delivering food to the ship's overworked crew. Although gentle and compassionate by nature, Reese shows stubborn determination when she's sticking up for her brother or scolding her timid "boyfriend" Bertuo Rodriguez.

(Source: The Gundam Wiki)