If it ISN'T Fatman, it's Olga in her Ninja outfit, with Fatman drawn over her. lol
Those are the characters you meet on that roof... unless the roof background is drawn in and its actually Stillman hiding in a food pantry.
Yes that's my guess (The other was only a quote written phonetically for lulz)
Olga Gurlukovich / Mr X / Cyborg Ninja 2
Or as Olga says to Ocelot: "Eh kind of Cyborg Neen-ja, com-plitt wid'eh sword".