So, since I've just outed myself as a fanficcer to absolutely nobody, I might as well tell you that I just signed up at the Into A Bar Community on Live Journal. And let me tell you, it will be epic.
This is how it works:
1) Choose a fandom character. They'll be going into a bar (or bar-ish environment), and they'll meet...
2) Another character from one of the other fandoms you've listed, which the community mods will choose via dice, dart-throwing, Ouja board, etc.
3) You make something about the meeting.
I am, of course, all about the epic, so naturally my walk-in is Bucky Barnes. And one of the fandoms I listed is My Little Pony: Friendship is Magic.
Now, I know what you're thinking--how could such an obvious pairing have never come up before? Because Captain America and MLP fit together like peanut butter and jelly, right? Or macaroni and cheese.
After all, MLP is all about the magic of friendship. And Steve and Bucky's friendship is nothing if not magical. And epic.
Steve would be a sickly little Earth Pony, who would come into his full Clydesdale size and strength after the serum. And he'd be plan brown. Like, the only MLP in existence that looks like a regular pony. Except for the red, white and blue shield on his butt.
And Bucky is Rainbow Dash.
(Only male, and dark blue and burgundy. Because yes, I have spent time thinking about this.)
And then, tragedy!
Rainbow Dash Bucky breaks a wing and falls out of a train, and he can't grab the door handle because ponies don't have thumbs. Earth Pony Steve entirely fails to go on with his life by crashing a plane, and wakes up in Canterlot in 2011.
And then, three years later, Steve has a brutal fight with the Winter Pony in D.C....
All seems lost, until brave Pony Steve is willing to sacrifice his life in the name of friendship!
And because of his heroic sacrifice--and how he tells Rainbow Bucky, "'cause I'm with you, 'til the end of the trail"--Rainbow Bucky remembers Pony Steve and stops trampling him long enough for the deck of the helicarrier to break and dump Steve into the Potomac. But Bucky dives after him and pulls him out of the water! Only he still doesn't have thumbs, so he uses his teeth or something.
Epic, I tell you. And magical. Like friendship!
Of course, with my luck, the intoabar mods will flip a coin and I'll get Arrow instead, which means I'll have to actually come up with something vaguely original that has humans in it. At least Stephen Amell totally rocks the shirtless, tormented assassin look.
Unfortunately, he poses for photographs like a corpse propped against the wall. But I'm good with angst; I can work with it.