It's more frustration than anything else. Mizore is a fairly uncommon character. There aren't many socially-akward stalker-esque anime girls. As such, I'd love to see some character development, just to see what happens. Unfortunately, I know that that will never happen because she's in a generic harem fanservice animu that always follows the same line: One episode that introduces and develops the new character, and then maybe one episode with further development (if it's more than 13 eps long). That's it. The rest will be focused on Moka, a character so predictable that any anon here can write what's going to happen during the next season.
It's a shame, really. Waste of a good character.