So Amy and me came up with this in TOTT, and we thought it would make a good roleplay (start of story is further down the post)
Character stuff:
Right, here's the list of characters you can use: (if someone joins late in the roleplay, we will just steer the TARDIS towards their character, so don't worry if you're a little late!) Characters with strikethroughs have been taken already, I'll put the person's name next to them so you know who's who

Dr. Who characters:
The Doctor We don't mind which number you pick, just tell us please!
Companions Once again, we're gonna be incredibly lax. Choose any companion, it doesn't matter which Doctor they were with, or if they're dead/trapped somewhere or not!
List of Companions for the RP:
Rory -Sky (preferred)
Roes -Amy (preferred)
Amy -Forgot-what-your-internet-name-is-will-fix-later
Villains Yup, you guessed it. We don't mind. But maybe be well-known villains, like the Silence and the Daleks, as this'll be easier for everyone to understand

Okay, we now have the Silents in here, with Rory

Artemis Fowl characters:
I think you know all the main ones, so here are the characters available for this RP:
Artemis
Holly
Myles and Beckett (both)
Mulch
Foaly -Sky (preferred)
Beetroot
Trubs
Sherlock characters: (note: they all co-exist in this one!)
Sherlock
John
Mrs. Hudson
Molly
Lestrade
Anderson/Donovan
You may play more than one character (especially at the start!) but say which is your preferred character. That way, we can let other people have roles later on but you can still keep your favourite part! It would be nice if you could take a character per fandom so we don't need too many people

Right, that's that over with. Sorry it's so long! Now, here's the very rough outline of a story idea for the start, so we have something to start off with:
In Fowl Manor, Artemis, Butler, Mulch and Holly are arguing over what to do with some stolen goods. Foaly, who has been listening in via satellite, decides to join them. However, when he makes it to the surface, he is just in time to see the TARDIS materialise over the group (he may or may not join them. Your choice!) and then disappear. Inside, the Doctor and whoever's with him are missing, probably tied up in one of the TARDIS's spare rooms (goodness knows how). The group start attempting to steer the TARDIS, and Artemis is the only one sensible enough to read the users' manual (but then he has to learn Circular Gallifreyan from scratch).
Sherlock and Jim are in the living room of 221B, arguing. John walks in in surprise. Suddenly, the TARDIS crashes through the wall! It picks up all three of them, and from then on I haven't a clue.
NOTE: we probably won't stick to that. So yeah.