Looking for something odd, a place to play a young Nymphadora Tonks! Basically, first war era. (Though I honestly would not be opposed to playing a Tonks in any other era, either.) Why wouldn't someone want a little girl drawing in a journal with crayons and likely getting into trouble with the grownups?
That said, games I'm in who need specific people;
foresightrpg/wethemods ; My Teddy wouldn't mind a trio-era REMUS LUPIN. My dear Luna would love to have ROLF, LORCAN, or LYSANDER SCAMANDER or a XENOPHILIUS LOVEGOOD. Some other people we need; JAMES POTTER, BELLATRIX LESTRANGE, RODOLPHUS LESTRANGE, and a whole load of other people!
darkestoftimes/dot_mods ; My Andromeda would kill for a TED TONKS. My Marlene would love a BENJY FENWICK because he is/was her fiance. Ginny would adore an ARTHUR WEASLEY, or GEORGE WEASLEY (or any Weasley, really). We could also use a NEVILLE LONGBOTTOM, PETER PETTIGREW, or KINGSLEY SHACKLEBOLT, among plenty of others.
thesandsoftime/modalert ; Sirius would love a JAMES POTTER, REMUS LUPIN, or PETER PETTIGREW. We could also use WEASLEYS (including RON), and many, MANY others.