No, not the Demogorgon from the Underneath. The REAL Demogorgon. When casting lots for who gets to fight which demonlord, why does GL get matched up with Demo? Depending on which mandrill head you are facing they each have a gaze attack that either charms or confuses its target, so whichever hero takes him on needs more than anything else WILLPOWER.
Also, GL great at using constructs to multitask. So, yeah, really the best choice when fighting the giant demon with two heads.