Sirin appears as 13 year old with golden eyes and purple hair. She was once 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. 

As a full Herrscher, she was prideful, cruel and arrogant, deeming humans as nothing but insects, but was also still a young girl who needed someone she could believe in, despite not being able to trust anyone.

And now... she is just a mess...