I came up with a name for the guy; Benjamin Brimley. He's intended to be an explorer; someone who travels around and searches for magical treasures. He's also intended to be the guy who coincidentally gets magical objects that either regresses him or push him towards the AB/DL lifestyle.

Here, he's gotten his hands on some ancient artifact only known as the 'Youth Pendant.' He's being chased by the pendant's protectors and needs both of his hands to do some extreme climbing and parkour. He holds the pendant in his mouth and obliviously regresses as he descends down the trees back to the ground to make a grand escape. Once he's down, however, he realizes quickly the Youth Pendant is just a magic, regressing pacifier.