Hello there, I'm Maestro. Not sure if you'd like me to contact you via PMs, but I guess I'll just post on the tread for now. 

I love most of your ideas, and I'll definitely be willing to play the canon characters while you'd play the OC. Here are the ones I'd love to play (in no particular order, just going down the list. Bolded ones are one that I'd really love to do.)

Hetalia: 

Prussia x OC 
France x OC

[b]Assassin's Creed 4:[/b]

Edward x OC

The Walking Dead:

Daryl x OC
Daryl x Carol
Carol x OC
Rick x OC

[b]Lord of the Rings:[/b]

Legolas x OC

[b]Thor/The Avengers:[/b]

Loki x OC (is one that I'd love)
Captain America x OC

So yeah, I think that's it! Thanks!