Muratova is a deadly weapon in human form. One would think that such an aggressive style would be a liability, but she makes it work. Just try not to make any sudden moves in her peripheral vision if you want your arms to remain in their sockets.
Muratova served as bodyguard to the head of the most powerful oil company in Russia. A hostile takeover attempt led to an extended melee, during which she neutralized two dozen would-be assassins. She relented only after her employer died of a flashbang-induced heart attack. Not much of a conversationalist, Muratova prefers to let her actions do the talking.
Muratova spent years honing her martial technique, and this training served her well in her previous employment as body guard. She has broken almost every bone in her body at least once, but it barely slows her down. She claims that it hurts less the more you do it.
Some of Nika's back-story is described in her datalog.
More of Nika's dialogue can be found on the agent banters page.
At the start of a mission: