I suppose I have a few more ideas for contracts, or contracted beings. We might need a shorter term for them, since "contract" really refers to the bond itself, and "contracted being" is a bit awkward.

Anyway, to avoid future issues, tell me which of these you'd be more interested in: Nyarlathotep (the Crawling Chaos), the King of Atlantis (name pending), Silene (the dragon slain by St George), Rokea (a shark-man of Hawaiian myth).