Compa, a nurse-in-training from Planeptune, combines a calming bedside presence with endearing clumsiness. Her identity originates from Konpairu Hāto (Compile Heart), symbolized by a black headband and "C"-embellished accessories. After discovering Neptune post-crash near her residence, she allies with her to confront Gamindustri’s threats, fostering a sisterly rapport with Nepgear ("Gear-chan") and dubbing Neptune "Nep-Nep." In combat, she wields an oversized syringe to inflict poison, paralysis, and elemental effects while healing allies or curing ailments. Though capable of summoning exploration-phase monsters, this ability offers minimal tactical advantage. Her hybrid offense-support role demands careful positioning due to vulnerability in close-quarters engagements. Narrative arcs highlight her versatility: crafting an eggplant-filled bento for Neptune’s reluctant New Year’s meal, briefly joining a short-lived 48-member idol ensemble, and navigating ghostly illusions during a Gamindustri Graveyard test of courage. Cross-dimensional iterations diversify her background—alternating between childhood camaraderie and adult-meeting dynamics with IF, appearing as a timid infant nurse-in-training in one timeline, or adopting roles like medical ninja or zombie-apocalypse merchant in spin-offs. External media collaborations grant her alternate costumes in titles like *Million Arthur* and *Senran Kagura: New Link*. Expanded lore includes drama CD missions—such as delivering (and losing) a Kabosu Emerald under Plutia’s orders—and light novel appearances. Trivia notes her puzzle-game preference despite quoting combat-game lingo, consistent mid-tier popularity rankings, and design elements like red plaid skirts, knee-high socks, and chokers. While generally gentle, she displays unexpected assertiveness when challenged, balancing innocence with quiet determination.