Honestly I was hoping for Momiji to be the next trial run. Helena, for someone to have about 112+ commands, she has a LOT of complicated tech to work with. She has 3 stances(including the neutral stance) to work with also.
The turn of all the free trial characters last 2 weeks, I wrote article about all of them in DOAW and so I'm used to this deadline. My suggestion is to focus your efforts on 1 character and I believe that you could learn to use at least one of them efficiently.