SLIME!!!
But srsly, these should be in a collab.
Square Enix- Ninja, White Mage, Black Mage, Slime, Sora, Riku, Crono
Capcom- Arthur, Chun Li, Ryu, Amaterasu, Chris Redfield, Jill Valentine, Amaterasu, Zero
Konami- Simon Belmont, Alucard, Solid Snake, Bill R.
Sega- Sonic, Tails, NiGHTS, Reala