Jake Armitage is as he appears in Shadowrun, with maximum possible stats and all cyberware upgrades. He brings to battle his Ruger Warhawk pistol, Defiance T-250 shotgun, Uzi III SMG, HK227 assault rifle, AS7 Assault Cannon, full body suit, and all his spells.
Duke Nukem is as he appears in the Duke Nukem series. He possesses his Freezethrower, X-3000, Explosive Ammo Shotgun, and RPG. He also has his Jetpack, Night Vision Goggles, Scuba Gear, and Holoduke from Duke Nukem 3D. Saxton Hale has granted Duke the power of AUSTRALIA. He has grown a MANLY MUSTACHE and speaks with great gusto, being immune to anything that would affect his mindset. In addition, he has gained AUSTRALIA MUSCLE MASS, doubling his raw physical strength, weight, and charisma.
Bryan Fury is as he appears in Tekken 6. He has access to all his moves and techniques save for any gameplay mechanics. Regarding weapons, he has all those that he wields in the game, including the gatling gun and rocket launcher from his ending. And yes, he's every bit as durable as he canonically is.
KOS-MOS is as she appears in Xenosaga 1, though she does not have access to Gate, Satellite, or S-Chain. She's strictly in her Red Eyes form, has access to only her techs as well as Shion's transferable ones minus Revert, all her weapons save for F-SCYTHE, and is in her best non-broken equipment. A piece of cheese has appeared at a point in the terrain equidistant from both teams. KOS-MOS will constantly feel a powerful urge to go to the cheese. Its thoughts will focus solely on the cheese, which it feels would be crucial to its victory. The cheese itself isn't special at all.
Fou-Lu is as he appears in his playable form in Breath of Fire IV. He has access to most skills and magic from his playable hybrid forms and can transform into any of his playable non-Tyrant/Infini hybrid forms, though he cannot use breath attacks. He is in a berserker rage.