Deo Cocky is a character from the anime Shin Bikkuriman. A demon by nature, his primary livelihood is theft, and he is driven by an ambitious dream of one day building his own demonic empire. In pursuit of this goal, he relentlessly seeks out treasure and valuable objects. His cunning and nimble nature make him a capable thief, as demonstrated by his significant role in the storyline when he successfully sneaks into the Time Castle on two separate occasions to steal the Holy Box.

Despite his villainous aspirations and sly demeanor, Deo Cocky cannot fully commit to being truly evil. He often adopts the persona of a crafty and sarcastic rogue, and he tends to be cynical and dismissive of matters that do not personally benefit him. However, this attitude is contrasted by a surprisingly pure-hearted and romantic side to his personality. He has shown a willingness to risk his own life to protect women he falls in love with, including Princess Pucci-Olin, Princess Pason of the Rubicon Area, and Bolkanne of the Beygirls. This contradiction between his self-serving nature as a thief and his genuine devotion to his romantic interests adds a layer of complexity to his character, preventing him from embodying a truly malicious villain.

Throughout the narrative, his key relationships are primarily defined by these romantic interests, which often motivate him to act in ways that defy his usual self-interested behavior. His role in the story is largely tied to his actions as a thief, particularly the two successful infiltrations of the Time Castle, which mark him as a character of notable importance despite his status as a demon who aspires to be a villain.