I make old villians from MLP G1 into MLP G4 version.
Erebus
Still he is demon cloud, but I make him look evil jinn/djin ( not the wishing genie, but jinn as evil spirit/demon from old legends East ).
he is devious trickster.
when he is angry, he turn into storm form.
he is former master of Grogar ( Erebus personal punch bag ).
King Lavan
I was inspired by other artists that made lava/magna/volcanic monsters.
he have short temper.
he enslaved umbra ponies ( I just ignore MLP G4 comic, because it have doubtful or not correctly canon wise and make umbra ponies as dark coloured pony unicors that use shadow magic/element/abilities ).
Sombra’s former tormentor.
King Charlatan
unlike his G1 counterpart, G4 Charlatan don’t have son.
he is orginal owner of staff of Sacanas.
he have cold personality.
Storm king used be Charlatan’s minion/henchman and Storm is mostly as target Charlatan wrath.