Beros operates as a devoted enforcer within the terrorist organization Humarise, answering directly to leader Flect Turn. Her duties center on neutralizing threats to the group’s objectives, including hunting defectors and securing high-priority assets. She possesses an athletic physique, short mint-green hair, and sharp eyes matching her hair’s hue. Her tactical attire features a gray sleeveless combat suit, a mask concealing her lower face, a green hooded cloak marked with red arrows, and a white quiver secured to her back. Steadfast in her allegiance to Humarise’s doctrine, Beros condemns Quirks as a societal plague, advocating the eradication of Quirk users to "save" humanity. This conviction drives her ruthless behavior, such as executing the traitorous Sidero during his attempted betrayal and showing no remorse for collateral civilian harm. Her Quirk, Longbow, enables her to shape her left thumb and pinky into the endpoints of a bow, firing projectiles with devastating accuracy and force—capable of piercing vehicles and homing in on targets. A critical limitation requires her to rely on external ammunition, from traditional arrows to scavenged resources like Sidero’s iron spheres. In *World Heroes’ Mission*, Beros is assigned to eliminate defector Alan Kay and recover a disarming key for Humarise’s Trigger Bombs. After sabotaging his vehicle, she mistakenly intercepts a briefcase containing stolen jewelry instead of the key, leading Flect Turn to demand she rectify the error at any cost. She relentlessly pursues Izuku Midoriya and Rody Soul across multiple encounters, including a train ambush and a highway confrontation near Klayd. During the climax, she temporarily collaborates with Sidero, using his Iron Ball Quirk to fuel her attacks until Katsuki Bakugo and Shoto Todoroki overwhelm her. Depleted of ammunition and facing capture, she quotes Humarise’s motto before leaping from a helicopter; her survival remains uncertain following the subsequent crash. Beros’s narrative arc is exclusive to *World Heroes’ Mission*, with no expanded backstory or appearances in other media within the franchise.