Kaia is a character from the original Dirty Pair television anime series, appearing as the primary antagonist in the episode Lots of Danger, Lots of Decoys. He is depicted as an effeminate male with brown hair and blue eyes. His background reveals that he shares a history with Kei, one of the two Lovely Angels, as a childhood friend from her past. At the time of his appearance, he has become the leader of a space pirate organization known as the Devil's Syndicate.

In terms of personality, Kaia is portrayed as flamboyant and confident, commanding his pirate fleet with a sense of personal showmanship. His primary motivation in the story is the acquisition of a valuable energy source called the Mineral Prism. His role in the plot is that of an antagonist who intercepts the decoy convoy of 3WA ships, including the Lovely Angel, in an attempt to steal the prism. He uses his knowledge of Kei to gain an advantage, correctly pressuring her into revealing that their ship is carrying the real cargo.

A key aspect of his character is his personal relationship with Kei. He demonstrates a clear romantic interest in her, treating their confrontation almost as a reunion. However, this affection is not reciprocated, and Kei prioritizes her mission over their past connection. His development within the episode is limited, as he remains a static obstacle. However, after his ship is severely damaged by a bomb that Kei tricks him into taking aboard, he orders his crew to escape. While his fate is left ambiguous, Kei later remarks that she does not believe he could be killed by such an incident, implying he is resourceful and likely survived the explosion. Beyond his leadership of the Devil's Syndicate, the narrative does not detail any other notable abilities.