His name is Nikolai Gogol, you can just say Nikolai. He is an angel and works in tandem with Sigma. He wants to be free like a bird, so sometimes because of this crazy goal he can drive himself to half-death, even though he is immortal, like all angels. He has heterochromia - his right eye is green and his left eye is blue. Gogol is presented as a rather cheerful sadistic angel who loves to ask others questions, and without waiting for an answer, immediately answer them.