I really like Iris's character design because it's totally different but the hair is a bit much I'll agree. Everyone will probably get use to it when the actual episodes come out and besides she's gonna be around for the next four years at least, so get used to her.
The Drowzee ain't gonna suddenly be male only, they didn't do that to the Ralts family when Gallade appeared in Gen IV. So they're not gonna do it now. Besides I really don't get how Munna could be related to Drowzee.