The Jabberwocky- AKA- the Jack of Hearts
This is another rather extreme rendition of the Jabberwocky. Instead of having just a single form, he is instead shown here in his Guarde/Battle-ready Forme with his Berserk/Jabberwocky form in the background. And while the Jack of Hearts does not thirst for battle, the Jabberwocky is a creature whose sole purpose in life is to kill, kill, kill.
And, yes, those red claws are his actual hands. He's the Queen's executioner.