The thing that makes me think Ne the most is building the characters worlds in his head.
This is anecdotal but I do that kind of thing, but I get bits of information here and there pop in my mind and have to pull them out to sort through and make something of them. I can't do it all in my head. I need to build a framework outside of myself to hang everything off.
There always needs to be a feedback loop with the external world in some way.
Well, technically, he creates character worlds on paper. The details are evident in the drawing. Like I said, his cartoons are literal in a way.
I know an ISFP can create characters, because ISFP novelists do exist
I think that's a matter of Fi in some ways.
For me, it's his speech that seems Ne. Just totally random sometimes, but if I listen hard I can see what he is getting at.
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure