Told you you'd be seeing more Fannin. This is merely a simple anatomical study I made for reference- I would like to make a full reference sheet, but for now this will do.

There's much more to the cannon revolving around Fannin and the reality he inhabits, but for now here's some general info:

Fannin is fairly emaciated because he burns a lot of energy using his 'vision'. He's physically blind, so in order to compensate he invades the minds of other living things to utilize their energy, or the minute electrical signals that are naturally used to power the body, often using many hosts at a time for a multi-sensory visual sonar.

In his blindness he is immersed in the ineffable geometric structure of the universe, he can see everything in existence all at once- it's past and future, and every possibility for what could have been had an event happened differently, but he cannot make sense of it, and it drives him crazy. It has done so for centuries....