Nikolai was Sharkhayes' brother. His first Captain's name was John Thomas Cahill. He turned rogue and stranded his brother, who also served under Capt. Cahill. The result was Nick Sharkhayes loss of sanity. The strange thing is, one of the brothers was born in Russia, the other in Spain.
Nikolai founded the Anti Drifters Navy of the Caribbean Sea. After he founded it, it was crushed by the drifters. He made a desprate decision. He decided to ally with Pearson Wright.