He looks exactly like Kazael, he is of mid height, a grin is always seen in his face, he has blonde hair, not too long but covers his eyes. He also wears a crown, but larger than Kael's.
"I'm better than you, brother !! "
— Raziel to Kael
Siel is also known as a genius, like his brother. He is also better than Kael in many ways, to which Kael angrily declines. At a young age, his brother cheated on a duel, so he was stabbed by his younger identical twin brother, Kazael, presumably to death, but he lived for some unknown reasons. His attitude is very similar to his brother, he is also very cocky and is a battle-freak, aside of that he doesn't consider himself as a prince, but as a King.