What characters/series should do a crossover/plot together?

What character's do you think would have good gaming chemistry or series together?

Here's mine:

1. Vaas from Far Cry with Adam Jensen in the Deus Ex universe.
2. Dante from Devil May Cry (not the reboot) with Ninja Gaiden. I'm undecided on the universe for this one
3. Tekken series vs Dead or Alive series.
4. Uncharted with Tomb Raider.
5. Splinter cell & Hitman. I think these two series could make a great crossover
6. Metal Gear Solid & Deus Ex

7. Battle Arena Toshinden series vs Soul Caliber series

That's all I could think of. What crossover's would you like to see?

I would love to get a Pokemon version of Monster Hunter if that counts?

@spike6958: That counts

Devil May Cry/Bayonetta (i need it)