Satsuki exhibits violent tendencies and emotional instability, with mood swings suggesting bipolar traits. She has a petite, loli-like physique, long black hair often in pigtails, and black eyes. Her typical clothing includes shorts, tights, and prominent makeup.

Intensely jealous and possessive, she fixates on Yuki Ice-T due to Yuki's romantic involvement with the Guardswomen Captain Hitomi Landsknecht. This jealousy triggers repeated physical aggression, from brutal beatings leaving Yuki bloodied to multiple murder attempts. Satsuki's obsession with the Captain fuels her yandere behavior.

She functions as an antagonist, disrupting Guardswomen cohesion through her volatility. Her narrative role centers exclusively on this cycle of jealousy-fueled violence against Yuki, maintaining a static pattern without development or resolution in official media.