Vergil, Nero and Dante (Devil May Cry) vs Kratos (God of War) and Asura (Asura's Wrath)
Kratos and Asura meet and decide that they have similar goals so that they will team up. They then decide to steal the power of Sparda as it will allow them to effortlessly achieve their goals, so Dante, Nero and Vergil (who has been resurrected) team up to stop them.
In character, no Powerups: e.g. Devil Trigger, Asura's Transformation or Kratos' God Powers.
No REALLY powerful weapons/items: No Yamato, Blade of Olympus, Hermes' sandals etc.
In character, Powerups allowed (still no Godmode for Kratos /or anything for Asura)
Powerful weapons allowed: Vergil has Yamato, and Kratos has Blade of Olympus and Hermes Sandals (No Speed Blitzing).
Win is by K.O or Death, no BFR or escaping.
Setting is deserted apocalyptic city, where the teams start 100 feet away.