These are fantastically amazinginiously fabulosity! I seriously cannot pick a single favorite out of the litter! You should be more honest in the future, lol! I would play a fighter featuring these charas any day of the week!
I can't say how much I really, really, REALLY, like these character designs! I like the "fear faces" motif, there. I recognize Uboa (thank you, PBG!) and... is that Breach from Generator Rex? Maybe not, but they do look similar. And those two down there... Goz & Mez influence, perhaps?
I love concept drawings and these are really great. I love the references and style but I'm curious, do you draw and doodle a creation or do you think of what kind of creature you want then draw?I don't quite know how to word that but I hope you'll understand.