Just from a personality standpoint, I'd expect Ashley to be a likely candidate. If it were up to me, I'd spend the entire morning having all of them take turns waking me up.
True, Kali doesn't really seem like a morning person, more like she is the one who you might need to awaken. Lucy might do it for her though.
Maria might also be less of a morning person, but you never know... Maybe you wake each other with some mutual rubbing in the spoon position.
Jin and Ann will likely be more than happy to help once we buy them, the other two elves could get there as well at some point.
With our current story, I can see Autumn being convinced that it the best way to prevent your problem from getting worse. Take care of it first thing in the morning, and you are good to go for a while!
A good kitty knows how to get her cream in the morning.
Emma might do it just to get a leg up on her sister, or just to get more practice, maybe it's another one of her fantasies to do that while you are asleep, or to wake you that way.
Even Ellen is getting to where she might be willing to do it, just to, you know, make sure you get to work on time, we can't have you late for Lin's head pats, now can we?