Derrick

remsleep

the current king of hell, Derrick has three primary forms he uses -- one strictly 'human' looking, the other a standard 'demon' look to match his siblings and the final is his 'royal' appearance, more fitting of a king of the underworld
called DH periodically, also referred to as Satan or King, whatever works
has a vendetta against human beings and organized religion, he has a soft spot for family but outsiders are less welcome with him
doesn't warm up or trust easily whatsoever, probably the most skeptical person you'll ever meet
was a parental figure to most of his siblings as he's the oldest, so he views them somewhat like his own children rather than siblings -- the age gaps are of hundreds of years or so, so it's understandable
he takes his position and his studies very seriously -- he practices magic often and dutifully, he's generally very organized and well-maintained -- he's the type to have cutesy office supplies and the type to use them
the sane one -- he's dutiful, well-mannered and overall a gentlemen, he's a good spokesman and a charismatic individual, someone suited for the position of making contracts with mortals and all that
his sense of fashion is more feminine, he enjoys purple + pink, flamboyant items and high-heels.

he was raised as a human with his catholic mother until his father, the previous Satan, came to take him to Hell in hopes that he would be a valuable assistant -- then DH was assigned the sin of Lust and tasked with that level of Hell, eventually DH grew to be more powerful than his father and he ended up overthrowing his dad for the sake of making Hell a better place -- as ironic as it may sound -- more for his siblings than for the sufferers of Hell, of course. Now DH is Satan and he's still a little conflicted about that. He was fed up with his father's negligence towards both his children and his responsibilities, so DH resolved to take it into his own hands.
recovering alcoholic -- he was profoundly depressed after his father Satan came and shattered his perception of reality, he's better now, but he's still somewhat reeling and he's always worried he'll fall back into old habits
exceptionally over-protective of his younger brother Switch due to the circumstances they share -- he raised Switch by himself up through Switch's teenage years, so if any of his siblings gets the parental treatment it's definitely him -- the two have a lot in common, including their senses of fashion.