Aya (アヤ, Aya) is a ninja and a Pokémon Trainer who specializes in Poison-type Pokémon. She is the younger sister of Koga, the Fuchsia City Gym Leader, the aunt of Janine, and is a student of the Gym. Apparently, she was raised by Koga since she was young.
Aya has blue eyes and green hair. Her attire consists of a female ninja-like outfit with pink and dark pink coloring. In the Johto region, the colors wew changed to red and black.
Apparently, she was raised by Koga since she was young (even before his daughter was born). She also has interest in poetry.