Jeffrey Jackson is a distinguished businessman, being the third in line to Jackeon Industries, a foreign technology company that his family owns. He runs a luxury hotel within the Delwis region, where his Gym is located.

Jeffrey presents himself as calm and collected, and maybe even a bit smug. But at heart, he's actually a bit of a trickster - he loves playing pranks on unsuspecting Gym challengers, and loves to entertain over anything else.