I've been on Mizahar on and off for probably . . . the better of three years now, perhaps four, and I keep coming back for more (though I forget my characters bloody names everytime

Basically, I haven't been around PROPERLY for a year or more, so I'm a bit iffy on some things; and have some very easy questions that I'd like to ask anyone who'd be kind enough to answer them.
a) Is the actor for Grenn, from Game of Thrones, taken as a character?
b) Is it possible to be mixed blood, both human and Isur?
Thanks and hello everybody!