Adon

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 strived to differentiate himself with more acrobatic techniques, Adon entered the first World Warrior tournament to prove he was more than that. The cocky Adon let his guard down when he faced Ryu, who took him out with a single Shoryuken. Afterwards, Ryu went on to defeat Sagat, which would lead to Adon’s eventual breakdown.
Adon was not mad at Ryu for defeating him, he was 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 challenged Sagat for the title of God of Muay Thai and won, but the enraged Sagat had done so much damage to him in the fight that Adon had to be hospitalized for months.
Adon’s injuries would eventually heal and a new fighter would captivate his attention. Rumor had reached his ears of a fighter who had mastered the power that had enabled Ryu to win the first World Warrior Tournament. Adon swore to find this mysterious fighter and claim the power as his own.
Adon appears in Street Fighter IV in Sagat’s prologue meaning he survived his fight with Akuma. He faces Sagat in a ring and is defeated by a single Tiger Destruction.