In the anime Reborn!, Birds is a minor antagonist who appears during the Kokuyo Arc as a member of Mukuro Rokudo's Kokuyo Junior High Gang. His background is that of an older man who had been in prison but escaped specifically to aid Mukuro in his plans against Tsunayoshi Sawada. He is originally from America, which contributes to his distinct foreigner aesthetic within the series. Birds is identifiable by his physical appearance, which includes grey hair and a face that looks older than his true age, suggesting a haggard or weathered look. He wears the standard green Kokuyo uniform complemented by a black bucket hat, and he is often seen carrying a cane that serves as his primary weapon.

In terms of personality, Birds is defined by a deep-seated sadism and a cowardly nature. He takes genuine pleasure in the suffering of others, a trait so pronounced that he experiences nosebleeds when he witnesses or orchestrates violence, particularly when he forces friends to turn on each other. His cruelty is methodical rather than impulsive, as he enjoys the psychological game of startling his victims and watching them squirm under pressure. However, this confidence evaporates the moment his plans begin to fail. When his schemes are thwarted, he immediately attempts to flee or sneak away, revealing a weak and cowardly core beneath his threatening exterior.

Birds' role in the story is confined to the Kokuyo Land invasion, where he acts as an obstacle for Tsuna's group. His primary function is to demonstrate the ruthless and manipulative tactics employed by Mukuro's gang. Rather than engaging in direct combat himself, Birds prefers to use hostages and leverage to achieve his goals. He employs his most notable ability, which involves several small yellow birds that follow his commands. These birds are equipped with small cameras, allowing Birds to project live images of his targets onto a wall using a remote control. This surveillance capability lets him monitor the locations of Tsuna's friends, specifically Kyoko Sasagawa, Hana Kurokawa, and Haru Miura. He also commands two formidable assassins known as the Bloody Twins, whom he positions to stalk these girls, ensuring that Tsuna and his friends cannot simply attack him without risking the lives of the innocents.

Birds' key relationships are primarily with his fellow gang members. He is loyal to Mukuro Rokudo, having broken out of prison to serve him, and his birds also serve a practical function as a signal to Mukuro if he is ever defeated. He also has a minor but enduring connection to Kyoya Hibari. After Birds is defeated, one of his yellow birds is taken in by Hibari, who teaches it the Namimori Middle School anthem. This bird becomes attached to Hibari and is subsequently nicknamed Hibird, becoming a recurring companion to the Disciplinary Committee leader. Birds' development within the series is minimal, as he appears only in this single arc and does not undergo any significant personal change. He is introduced as a cunning sadist and is ultimately exposed as a physical weakling. His defeat comes swiftly at the hands of Tsuna and Hayato Gokudera after his hostage situation is dismantled, and he is not seen again in a major capacity.

Regarding his abilities beyond the bird surveillance, Birds wields his cane as a weapon. He can slam the cane into the ground to reveal a long blade hidden within its shaft. This weapon can be electrified, or in the original manga, coated with a potent poison, making it a deadly tool. Despite this, Birds shows little capacity for direct fighting, relying entirely on his minions and psychological warfare. Once cornered, he is easily overpowered, with Gokudera delivering the final blow that defeats him. His lasting legacy in the series is not his own combat prowess but the unintentional contribution of his bird to Hibari's entourage.