Hulk

Bruce Banner (aka Hulk) is a character in once upon a time

"Yesterday is bad"
hulk debuted in the episode Yesterday is bad where he Mike, Batman and Prince Charming spy on Darkseid

Trollwick's scrolls
hulk was saw on one of Trollwick's scrolls

"Klunk"
Maestro spied on Hulk

"The Stealing"
Hulk saw his future version after stealing the Scroll Of Time-Travelling and traveling forward in time, but his future self Maestro is his enemy and he is forced into the contest of champions, while Grinus notices that the scroll is gone while Hulk and Prince Charming are back in time