Sirin appears as a young girl the age of 13. She has long purple hair and yellow eyes. Originally Sirin was a kind and caring girl, thinking of everyone as a friend. However, with the experiments in Babylon Tower killing all of her friends, she grew a complex for power and revenge, refusing to die, and suffering the abuse, she wanted to kill everyone in Schicksal. It is hinted that Sirin is afraid of Siegfried after he crushed Sirin's forces, and cut her arm off(which she regenerated.)