Prince Sincline

Crown prince of Galra and a halfAltean. A dangerous and cunning adversary his only weakness is the fact he fell in love with Princess Fala who somewhat resembles his mother whom his father Emperor Daibazaal killed for refusing to marry him. He plots to overthrow his own father and marry Princess Fala. He is a sly scheming villain who has a sense of honor preferring to fight fair over his fathers dirty tactics and is Akiras frequent rival. In one last confrontation after being defeated by Akira in a duel he decides to use Ryou as a hostage. While attempting to destroy GoLion to avenge himself of his previous defeats and rule the universe an enraged Ryou stabs him and they both fall to their deaths.Source Wikipedia