Nemo is no longer in the parks.
This has come up in a couple of different threads.
When Finding Nemo was first released he could be found at the TTC in the mornings as guests arrived. He also led the parade for a couple of weeks.
No, he could not sign autographs. He was a large plastic fish, on wheels, like a float and left a trail of bubbles! He was always with a seaweed friend!
Sorry to disappoint.