Pete says he didn't do it on purpose, but I don't believe him! He's been such a bully in the past, you know?
–Gremlin Bennet, Epic Mickey
Gremlin Bennet is a GreenGremlin who lives in Gremlin Village. He is angered by Small Pete, who crashed his boat into the village, certain that it was a purposeful attack.
He will point Mickey to Small Pete's boat where his Ship log is located. If Mickey shows the log to Bennet, he will tell all the other Gremlins.
Later when Mickey meets Small Pete again, he will give the mouse his treasure. Also, when Mickey reaches Mean Street, Pete will give Mickey lots of E-Tickets, and the Small Pete Pin.
Because the PC files for Epic Mickey 2 say that it is Gremlin Calvin who is trapped in the Train Tunnels and Shaky as one of the unnamed Gremlins on Mean Street North, it is highly possible that this means that it is Bennet who is trapped in Fort Wasteland.