Nikolai, a character who always help save the day by rescueing Price and Soap from the boneyard, providing intel about Makarov, assisting Soap's medical attention and providing extraction after operations. Not only he is a big helper but he is like a flying taxi saving lives and providing important intel.
In Modern Warfare 1, he had been an informant for the SAS until his cover was blown and was later rescued by Captain Price's squad. He later sent the exact location of Al-Asad's safehouse. In Modern Warfare 2, he rescued Task Force 141 from Brazil using a Pave Low, rescued Price and Soap from the Afghan boneyard using a C-130 and rescued them both again using a Little Bird after General Shepherd was killed. His ability to fly multiple vehicles is highly excelling. Modern Warfare 3 saw Nikolai providing assisstance to Soap wounded in action. He later provided air support in a Mi-24 during an operation in Somalia and provided important intel while helping Price and Yuri catching Makarov at a hotel.