Istanbul is a male cat. He is 8 years old and suffering with 'lazy eyes.' He can only see most of the surroundings with the night vision glasses. He can see zoomed in and with night vision. He is pretty of an childish cat. 
Fex's sister Foxcup is his owner, but Fex takes care of him more. 
He used to be an Christian, converted to Islam later on. He believes that Turkish race is superior and dislikes Armenians, Greeks, Jews etc. He works for an group called "Genocide cats".