Hikari only fantasizes about biting Yuki because she's sure a snow woman's blood would keep a vampire cool from direct sunlight.
What if YuruYuri was mashed up with Monster Musume? Half-monster girls sitting around talking to each other sounds about right for slice of life comedy. That's pretty much what the title translates into anyway, "I want to talk to half-monster girls." Making a good first impression was the vampire girl Hikari. She's a constant source of funny facial reactions with a positive attitude.
Hikari has a big personality and I'm sure her charm is going to drive the interactions for most of the season.