Lion-O

Lion-O is a superhero and the main protagonist character of the ThunderCats franchise. Lion-O is the leader and the hereditary "Lord of the ThunderCats". Lion-O is based on the lion and wields the legendary Sword of Omens, which is able to fire bolts of energy and allows Lion-O to see across great distances with the embedded Eye of Thundera's power of "Sight Beyond Sight", as well as the Claw Shield, a gauntlet that launches grappling lines from its knuckles.

At the beginning of the series, Lion-O initially had the physical appearance and mind of a twelve-year-old. Due to his apparent suspended animation, he was physically aged to an adult, prompting him to start maturing to live up to his age.