Yayoi Yoshitomi, a dedicated member of the Hakuoh Academy Space Yacht Club recruited in Marika Kato’s second year, sports long light brown or green hair with twin curling bangs and a light green hairbow, her brown eyes reflecting quiet determination. She layers a pink hoodie over her school uniform during club operations, adopting a cowgirl costume for the *Princess Apricot* raid in the anime and a kunoichi outfit in the novels. Initially reserved, she blossoms into a confident, reliable teammate, leveraging her family’s ownership of a two-engine cruiser to master mechanical systems—skills crucial for maintaining the *Bentenmaru*’s dual converter reactors during high-stakes maneuvers like stabilizing FTL jumps.

Her contributions span multiple missions: she aids simulator training, supports rescue operations for Jenny Dolittle, and partners with Chiaki Kurihara at the engine console to enable successful hyperspace launches. Though eliminated in the Nebula Cup qualifiers, she later engages in tactical dinghy simulations and assists in boarding the *Parabellum*, balancing combat readiness with academic worries. In *Abyss of Hyperspace*, she devises recruitment strategies, executes decoy tactics against the Yggdrasil Group, and joins the *Odette II*’s crew to safeguard the *Bentenmaru*’s retrieval of the Advaseele. The novel-exclusive Timeslip Arc sees her operating the *Odette II*’s engines during a temporal anomaly, strategizing with Marika, Lynn Lambretta, Jenny, and Gruier Serenity.

Proficient in both the *Odette II* and *Bentenmaru*’s systems, her hands-on piloting remains confined to simulations. Collaborative by nature, she forges strong bonds with all club members, consistently contributing technical expertise across missions while adapting her raid attire to the distinct styles of anime and novel portrayals.