This fighter plane here is a custom made model based on Japan’s Nakajima Ki-44 fighter plane back in WW2.
On building this you need 16 sheets of papers and lots of blue color ink. In terms of difficulty, it’s hardcore. Needs lots of patience as it has many small parts and places that seems hard to glue on.
He seems to like designing cute and moe-ish like paper crafts and has lots of unique super deform model in collection.