Belos, also known as Beros, is a member of the terrorist group Humarise in *My Hero Academia: World Heroes' Mission*. She serves Flect Turn, dedicated to his mission of eliminating Quirk users to avert the prophesied "Quirk Doomsday Theory." Lean and athletic, she has short mint-green hair and sharp eyes of the same color. Her attire includes a gray sleeveless combat suit, a lower face mask, bulky cream-colored boots, and a green hooded cape secured with a red arrow-shaped pin. A white quiver is strapped to her back. Beros exhibits unwavering loyalty to Humarise's cause, viewing Quirks as a sickness requiring atonement. Her fanaticism manifests in ruthlessness; she endangers civilians without hesitation and executes fellow member Sidero for attempted betrayal. Her Quirk, **Longbow**, transforms her left thumb and pinky finger into the ends of an archery bow. Though she cannot generate projectiles, she fires provided ammunition—like arrows or Sidero's iron balls—with tremendous force and precision, capable of penetrating vehicles. She demonstrates advanced trajectory control for homing shots. Beros is also a highly skilled motorcycle operator, utilizing this during pursuits. Her actions center on retrieving a critical briefcase containing the master key to disarm Humarise's Trigger Bombs. She kills scientist Alan Kay, who fled with the case, causing a crash where Rody Soul accidentally takes it. Beros relentlessly pursues Rody and Izuku Midoriya across Otheon and Klayd to reclaim it. She launches multiple attacks, including firing arrows at a train and wounding Izuku in an ambush. Later, alongside Sidero, she assaults Izuku and Rody near the Klayd border using a helicopter. When Sidero surrenders and offers Humarise intel, Beros executes him for treachery. After Katsuki Bakugo damages her helicopter and she exhausts her ammunition, she deactivates her Quirk, declares loyalty to Humarise's motto—"For the salvation of humanity"—and jumps to her death to avoid capture. Her ultimate fate is unconfirmed.