I read a post for MK vs.SF vs. Marvel vs. Capcom. No way in the world !
I do believe I've got a better idea for a better crossover fighting game : Mortal Kombat vs. Killer Instinct .

Representing MK :
1.Scorpion
2.Sub-Zero
3.Liu Kang
4.Raiden
5.Kano
6.Johnny Cage
7.Sonya Blade
8.Baraka
9.Mileena
10.Shang Tsung
11.Prince Goro
12.Quan Chi

Representing KI :
1.Chief Thunder
2.Spinal
3.Fulgore
4.Jago
5.Glacius
6.Cinder
7.B. Orchid
8.Sabrewolf
9.T.J. Combo (without the boxing gloves)
10.Kim Wu (from KI 2)
11.Tusk (from KI 2)
12.Maya (from KI 2)

Bosses: Shao Khan; Eyedol; Onaga, and The Gargoyle Boss from KI 2.

Imagine Scorpion battling Jago or Chief Thunder battling Shang Tsung. The possibilities are endless.

If anybody should read this message, sumbit your own ideas, and let's send it to Mr. Boon.