As a rule (as much for you as for any future potential applicants that might by chance spot this post), at least in my RPs, if the first word in the tag-list under the RP title (also visible on the RP page itself by the words "Join status" says "Apply" rather than "Full", it is accepting new players.
Regardless, I'm happy to see interest so soon after posting in the Interest Check. Welcome!

Hmm... interesting. There's certainly something for me to work with on this character, which bodes well for how interesting its story will turn out in the long run. I only really have two points that I feel need clarification:

In the last paragraph of his background, you state that Yarrow discarded the ideals of the Greywoods and became a socialite, presumably trying to build relationships with some of the people he wasn't allowed to interact with before. Anyone in particular? Did he just get buddy-buddy with random (predominantly newly risen due to the Night of the Blood Moon) aristocrats, or do you imagine there's certain people he would have been more or less inclined to associate with? The easiest would obviously have been the Healing Church (specifically the White Church, since the Black Church isn't known for its social graces and doesn't waste their Hunters' time by having them attend parties), but I suppose he could have built other relations if he was cautious enough.

The other thing that needs clarification is the "race" being (False) Paleblood. You aren't the first one to write that, and I see how it can be confusing, so just bear with me for a moment. I use [I]Paleblood[/I] about naturally occurring, "true" Paleblood. [I]False Paleblood[/I] is the artificial imitation of the former. [I](False) Paleblood[/I] is a shorthand way of referring to both of these collectively. Using (false) Paleblood might be correct if there was doubt which one he was (though it wouldn't make much sense initially, when he'll (probably) still just think that he's an "ordinary" Hunter), but I would like it specified for your characters.
So long story short, please put the race as either Paleblood or false Paleblood.
(EDIT: Considering that Yarrow became a Hunter for profit rather than to treat a disease, I suspect he would be a false Paleblood Hunter.)

Beyond that I don't think I have anything to interject.