So you are gonna do a Primeval with Reptile, a Grave with Smoke and a Sun with...uhhh...Ermac? Rain? I mean I guess you could just use Raiden, but that sorta screws up the cycle.
I really like these, and like Elliots' suggestions. Are you thinking about doing more if you ever get the free time?
Definitely Felicia. Buried under commissions for another week - then hopefully I'll get to paint some of my own ideas. :D