Well, they could always do Might maneuvers the first turn

This is exactly what I was thinking actually.  By themselves they are never dangerous unless they surprise people.  Also they rarely seem to kill people by NOT eating them.  So what I was thinking is if you have say 4 of them, 3 of them perform maneuvers (might, contacts, or  intimidate) that the last one tags.  Suddenly that fists +1 is now +7, and that is fairly dangerous.  Like previously mentioned base venomous off of might instead of fists and you are golden.

For the life sense, I was thinking more of a long distance sense for when they have covered the earth and somehow 10s to 100s all end up crowding around some abandoned farmhouse in the middle of nowhere.

I just can't see how the white court brought down the entire red court of vampires. This system is not meant for large scale engagements. 

Not really sure I'd rely on the novels to be recreatable by the game but:

Not too sure I agree with you on the ninja mechanic.

Always was kinda curious how that worked actually. 

If you have diamond skin (like mythic toughness) could you really feel anything?  Nevermind, if they are actually that tough/strong/whatever, wouldn't it almost be like making love to a marble statue.  Talk about chilly, uncomfortable, and possibly extremely painful.

Definately Mary Sues.  TBH, it seems like the entire urban fantasy genre is getting like this (it's mostly from the female writers).  Jim's work is a nice change of pace as he pretty puts all his character's through the ringer.  I wouldn't be surprised if some stuttering guy runs over one of the major people with a concrete roller sometime in the next few books.

PS: Love the write up for those Adin.  Only issue is that starting with having mythic EVERYTHING might be a bit much.  If they did, I would make it where they can be dominated by any that are older and have little to no free will and are not driven completely mad by bloodlust (or they would just kill anything they see).  Also you might want to consider making it where creating one is a major undertaking and somehow links them to their creator, that would get rid of the possibly of creating a bunch to use as disposables which has also been done to death. 

You could make this your High Concept and use compells and fate points from there.  That way you keep the pure mortal bonus.  A lot of the time it really won't matter.  Taking a card every hour in game would make things very crunchy and more about the character than the overall story, which imo isn't a good thing.

Past that if you are going to use an actual deck, definately use a tarot one.  Your negatives would just be the card reversed. When you consider the fact that they also have multiple meanings...

Personally I never understood that.  You have to have a pyramid in everything else for fate, why not the focus items?

It is one of the things that makes wizards too powerful.  Which is even worse when it's combined with players that go "well I use spirit(or whatnot) for everything".....   

A couple things.

Athletics is way to high (should only be good)
Intimidate is too low
Alertness is too low (remember this is intiative also)
No Ride, Drive, Survival, or Discipline skills

Squit could just be a stunt that lets you use Intimidate with Presence (though Presence could also be a bit too high).

You would probably be much better off doing a broader tree.

Think Sanctaphrax was more refering to the fact that the Denarians ALWAYS transform to their combat shapes when fighting.  If they didn't have to do this why would they???  I mean it is kinda hard on clothes.

So yea MOST of the Denarians (at least the ones that can pass as human) should have human form.

Actually he probably has at least superhuman strength after taking the mantle.