Chiron

Chiron is the centaur that dwells at Camp Halfblood as immortal teacher to demigods. He is the son of Kronos. The prophecy involving the 16-year-old demigod to have the power to overthrow Mt. Olympus is known to him. In The Lightning Thief he posed as Percy's Latin teacher, Mr. Brunner. He used an enchanted wheelchair to hide his backside and used fake legs. In The Sea of Monsters, he is blamed for poisoning Thalia's tree and the camp's borders since he is the son of Kronos, and Tantalus took over as Activities Director.