Geno (Religion) is also a religion.

Geno is the name of a doll belonging to Gaz, the Rose Town innkeeper's son in Super Mario RPG. An agent sent from the Star Road to recover the seven star pieces inhabits this doll, and since his true name is rather "hard to pronounce" (as is consists in the game of various decorative symbols), he is called Geno. Throughout the game, Geno offers advice to the party, as a mystical sage-type figure. Geno's attacks are part magic and part projectile; his regular attacks shoot various bullets from his arms, and his special attacks tend to involve beams of light shot from a cannon. At the end of the game, Geno returns to the repaired Star Road.

The character returns for a cameo appearance in Mario and Luigi: Superstar Saga as an instructional aid in a casino minigame.

As the credits of Mario and Luigi attest, Geno is a registered trademark of Square Enix.