Natsuo Tanaka is a Slifer Red student who appears exclusively in Yu-Gi-Oh! GX Spirit Caller.
Natsuo can be found in the areas surrounding the Red Dorm.
He gives the player various gameplay tips throughout the earlier parts of the game, such as visiting the Research Room for its Duel Puzzles and investigating the island to find unusual opponents.
Natsuo can sometimes give the player a "Strike Ninja" or "Fuhma Shuriken" card if he is defeated after they register each other as duelists.
- Natsuo uses this Deck at the beginning of the game.
- After the player defeats Jinzo, Natsuo switches to this Deck.
- Once the events involving the Shadow Riders begin, Natsuo switches to this Deck for the rest of the game.