With Nigel like any character his face is the most important part of his "Character", and with Nigel being someone who's role changes in his story, I had to design him to go from scary to endearingly creepy.
Something that comes to mind when i'm trying to describe this is the scene from "How To Train Your Dragon 2" where toothless has been brainwashed, he becomes legitimately creepy before going back to his normal self. So kinda like that but reversed.
So here are the influences I took for his head. I'm sure you can see where I mixed and matched parts for him. Specifically the spines and colours from the JP3 Velociraptors are a big influence for his hair and textures, and the overall headshape, eyes and jaw are Angler Fish based.
AND FINALLY. This video best shows the sort of character I best see him as, unstoppable stalking villain, to endearing creepy weirdo trying to reclaim some of his humanity.