I read this graphic novel about four to five years ago.
It has traveling between worlds, I think. Maybe the ghost and the human world? But I don't know - I do know that the character met his grandfather and can fly. There's a lot of other magic, like changing sizes and maybe teleportation.
A bunch of other random facts from the story:
- They ate spiders
- The characters in the (maybe) ghost world aren't really human
- Time/world travel ship created by a women
- The people sent to fetch the main character were in a relationship
- There was an evil dude who used this weird machine that produced green light to determine the main character's potential
Is there any fantasy graphic novel that fits this description?