Yes! I've finally defeated Yami (from Okami), the final boss of Tatsunoko vs Capcom! I literally jumped off the sofa in excitement when I got the "YOU WIN" message :P

Characters I used:
Batsu (Rival Schools)
Morrigan (Darkstalkers)

Batsu died really quickly during the battle against Yami's final form, and I had to use up all of my Super energy to defeat Yami.

After that, I ended up unlocking this unknown character called Saki, which is said to be from a game called "Quiz Nanairo Dreams". If anyone knows about this unknown game please fill me up on this.

I now have 3 more characters to unlock, and thus meaning I'll need to defeat Yami 5 MORE times.

Haiz......