J, frequently referred to as Pokémon Hunter J, is a ruthless, greedy and cruel Pokémon hunter who, with the help of her henchmen, captures and steals Pokémon and sells them as requested by her clients for a profit on the black market.

She is a slim woman, who has greyish-blue hair. She has an outfit, composed of a long purple collared jacket, with two pockets, but without her left sleeve. In addition, she wears a red outfit underneath, with red heels. On her left arm, she has a gauntlet, which lets her shoot a beam that petrifies Pokémon. On her missions, J is usually seen wearing goggles.