Savior. Hero. Conqueror. Villain.
They managed to steal half of the republics fleet. Make their own empire. Get kidnapped and brainwashed to forget their identity, and still manage to be the most powerful person in the galaxy.
Gaslight: 1) Rallied many young jedi knights to their cause in Mandalorian Wars which made them disregard council's worries that there are something even more sinister on the horizon. They all save for an Exile either died or fall to the dark side. 2) Gaslighted ancient tribal amphibians to let them pass in the temple to destroy Star Forge while actually planning to use it themselves. 3) Jedi mind trick. Just jedi mind trick. 4) Laughed so hard at his personal killer robot describing his best friend with "meatbag" (and Malak being greatly upset by it) that decided to programm said assassin droid to refer to all organics as "meatbag".
Gatekeep: 1) Closer to the end of Mandalorian Wars become much more pragmatic and ruthless locating those Republic (allied!) forces and jedi who weren't loyal to him enough near an orbit of Malachor so when Mass Shadow Generator was activated it wiped both Mandalorian and Republic ships simultaneously leaving Revan's fleet mostly unscathed and other too destroyed/suffering heavy losses. Well not so much for wiped more like crashed on the surface of planet destroying it with it's inhabitants too. 2) Didn't tell anyone about Star Maps and Star Forge (except for best friend Malak with whom they discovered it) - almost omnipotent shipyard capable of creating countless ships/droids/whatever needed for war effort.
Girlboss: 1) The ultimate reason Republic didn't fall to Mandalorian neocrusaders. 2) Survived (albeit with Bastila's help) a heavy cannon strike on the flagship's bridge. 3) Were cool even with total amnesia, then remembered who they were and depending on player killed their ex-apprentice and reclaimed the mantle of the dark lord or stopped the maniacal tyrant of ex-bestfriend and became the Prodigal Knight.
Goldie O'Glit
She manipulates children, uses the fact scrooge has a crush on her to her advantage, and regularly schemes to get stuff (such as sneaking into a child's birthday party for money)