Maybe he's a magical character on an adventure to save a fantasy world.
The cartoon old man might look quite unique. With a wing hat and a big nose, he could give off a somewhat magical or comical vibe.
Perhaps the cartoon old man with the wing hat is a guardian of a fantasy land, using his hat to protect the realm from evil forces.
Maybe he's a magical wizard on a quest to save a fantasy world. Or perhaps he's a wealthy gentleman with many adventures and secrets.
Perhaps he's a magical character who can change the world with his long nose. It could be full of adventure and surprises.
Perhaps it's a fantasy character on an adventure in a dark world. The hat could be a symbol of his special powers or a clue to his destiny. Or, he could just be a normal guy lost in a strange place.
He might have a comical appearance, with the big nose and mustache adding to the funny look and the hat completing the unique style.
It could be part of a mystery cartoon. The hat might hold clues to a hidden treasure or a forgotten past. Maybe it was lost by a magical character and now it's waiting to be found and restore some lost power.
Maybe the grandpa is a genius inventor and the lightbulb hat helps him come up with amazing ideas.
It might be a slice-of-life cartoon showing the daily life of the old man with a big nose and his interactions with others.
It could be a humorous cartoon where the big-nosed old man gets into funny situations.