Sorry Prime.🙁 Well, I don't know a whole lot about Fox, so I'll post Cobra's strengths.
Pain: Controls hornets that he employs in battles, allow him to teleport, and can hide a Tommy gun in them somehow. He has Queen Hornets he keeps in his stomach that can burrow into their victims. He is also the largest Cobra member which helps him H2H.
Fear: He is triple jointed on every joint in his body. this allows him to climb and run quickly similar to a spider. He has two crossbows, the larger one fires bolts slowly but powerful enough to knock enemies off their feet and the smaller when fires rapid bolts. He has normal bolts, poison ones, and ones that explode. He has a suit that makes him almost invisible to the naked eye. He can use his superhuman flexibility with great effect H2H.
The End: Is a legendary Sniper that can absorb sunlight to give him stamina and great running speed as close range is not his forte. Before escaping he uses a flash bomb to blind oponents. His camo grants him his photosynthetic capabilities and lets him hide in forested areas, unfortunately since the thread creator made the fight take place in Arsenal Gear his camo is useless. Thanks. 😠
Fury: Wears a space suit, has two flamethrowers and a jetpack, what more can be said?
Sorrow: Is a medium that can talk to the dead to find out the positions of enemies, also if someone on Fox dies he can summon their ghost and use their abilities.
Boss: Is a CQC master which is a H2H form she and Naked Snake created that can allow her to take even massively physically superior people like Volgin(in a straight up fight he'd win, had to get that out) down in one move. She uses a knife and a Patriot Gun which fires rapid volleys of bullets that have no ammo limit.