Prince Sincline

Crown prince of Galra, and a half-Altean. 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 father's dirty tactics, and is Akira's 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)