I started RPing later last year and have at this point made five RPs with three being pokemon based.
Reapers and Novia are still going with Reapers being my first real success. My very first RP, The Pokemon Survival challenge went reasonably well at first but, as you said people began to drop out activity, Aeterna crashed and burnt in the OOC and Ultima still has one die-hard player (excluding myself) but really is like a person clinging to life on the edge of a cliff by one finger and is going to be officially dead sooner rather than later.
How do you mean a theme?
I'm looking forward to what you come up with :D
My own SU is in the post directly below the OP.