I Might Enter This CCOS, but I have No Idea Which Of My Concepts to Use.

I just learned what that is this month, and I am considering entering. But I cannot choose between a couple. Any ideas

My choices include: Leena, The Half-Breed Queen, Aaron, the Gunslinger, and last but certainly not least, Lynn, the Avenger. I have others, but I'd rather not use them yet, as I do not believe they're ready. (I still work on them afterwards to make sure they are proper)