Koga's appearance is based on his game counterpart who had blue green short spiked hair and black eyes. In the anime, his hair is shown to be dark blue and his brow is black but in flashbacks in the BW series it was reverted back to his natural hair color.
His primary appearance is a blue long sleeve ninja suit with a black mesh shirt underneath and black boots.
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Pokémon the Series: The Beginning
After Ash battled Aya, her brother, Koga, arrived. He stated nobody could leave until the battle was over. Ash sent out his Pidgeotto against Koga's Venonat, who evolved into Venomoth. Venomoth launched Stun Spore and Sleep Powder, affecting Ash's Pidgeotto. Ash sent out Charmander, who launched Flamethrower, canceling Venomoth's Stun Spore. Just then, Team Rocket arrived and stirred trouble by throwing some sticky substance, which binded everyone to the floor. As Misty wanted to sent out Starmie, Psyduck came out and Arbok bit on its head. Instead, Koga used Voltorb to make the group escape out of the Gym. However, Team Rocket tracked them down, where Psyduck's psychic powers triggered and blew them away. Koga was impressed and proposed a trade, but Misty refused. Outside, Koga and Ash had their battle uninterrupted. The two have a one-on-one battle, with Ash using his Charmander, and Koga using his Golbat. Initially having some trouble, Charmander was unable to hit the Golbat, but after using Fire Spin, Ash was the winner. Upon leaving, Koga rewarded Ash with the Soul Badge.
Pokémon the Series: Black and White
Koga appeared in Ash's memory when Ash remembered Charizard's past and its battles.
- English: Stan Hart
- Japanese: Hōchū Ōtsuka
- Polish: Radosław Popłonikowski
- Spanish: Juan Fernandez
- Iberian Spanish: Gerardo Vasquez (Indigo League) Jorge Badillo (BW: Adventures in Unova and Beyond)