So far, none of the new cast members are remotely interesting. Organ's familiar is the most interesting thing out of them, and only because it's a weird looking bird. Mikan and Yuki were quick to set their roles, both as the tough girl that's able to back her words up and the perverted boy who wants that demon lord D in his butt, yet these three characters don't really have much to them as of yet. The chuuni especially has a lot of work to do to be interesting, since she's so generic so far.
Regardless, I'm glad there's more action on the way.