Antonio Guster is a character in the F-Zero video game series. He's best known as a rival of Samurai Goroh. Years ago Goroh was disbanded from the Internova Police Force, and he went to Antonio Guster for help starting his new found bounty hunter career. The two were friends and partners for years and would never refuse a bounty. However, on one mission Goroh abandoned Antonio and let him get captured by police. He managed to escape with three other prisoners, and he became enraged once he found what had happened, and vowed to get revenge.
He almost killed him once by poisoning him, though was forced to give him the antidote.
Oddly, Samurai Goroh is Antonio's brother in-law after he got married to Antonio's sister Lisa.