Nico 'Sonny Santino' is Vinnie's old friend and younger cousin from Russia. Nico was born in 1996.
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Nico is first mentioned in the mission Midnight Runner in Moscow, Russia. He asks Vinnie to help him kill the target in such a way to make it seem like Nico had done the killing.
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He is always there to help Vinnie when he is in Russia for contracts his weapon is Luger P08 Silver, and his weapon barrel is short. He lets him use his Jeep in St.-Petersburg and his Mi-24 helicopter when he fixes it.