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Adon (katakana: アドン, thai: อาดอน) is a character from the Street Fighter series of fighting games. He has appeared in the first Street Fighter game, and notably the Street Fighter Zero series. Adon also appears in Super Street Fighter IV.
Adon became Sagat's student three years after Sagat became God of Muay Thai. Frequently likened to a "lesser version of Sagat", even though he has strived to differentiate himself with more acrobatic techniques, Adon enters the first World Warrior tournament to prove he is more than that. The cocky Adon lets his guard down when he faces Ryu, who takes him out with a single Shouryuuken. Afterwards, Ryu goes on to defeat Sagat, which leads to Adon's eventual breakdown.
Adon is not mad at Ryu for defeating him, he is mad at Sagat for being unable to uphold Muay Thai's honor (conveniently forgetting how Ryu had bested him during the World Warrior tournament). He challenges Sagat for the title of God of Muay Thai and wins, but the enraged Sagat does so much damage to him in the fight that Adon has to be hospitalized for months. Adon's injuries eventually heal and a new fighter captivates his attention. Rumor reaches his ears of a fighter who has mastered the power that had enabled Ryu to win the first World Warrior Tournament. This fighter kills a man who was about to challenge Adon for his title. Adon sees this as a challenge. Knowing only that this mysterious fighter has red hair and wears a black gi with the symbol "Ten" on his back, Adon swears to find him and test his strength.