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There's been a rise of people making Dark Urge OCs because of how narratively interesting and fun that origin is and as a primer: you gotta be fucked up about it. No matter how dark you think you are, canon was a thousand times worse. You cannot have a cute uwu naive submissive idiot who gets abused by gortash. That's not how it went.
The dark urge canonically eats babies and dwarves, murders families, fucks corpses, VIVISECTS PEOPLE, before the tadpole. There is an ending (unsure if actually in the game but it is in the files, if you lose the fight to orin) where the dark urge becomes basically an animal whose sole purpose is to make more bhaalspawn by fucking whatever they can.
That's who you were. You were a monster who wanted to kill everyone alive on Toril in a sea of blood after turning them into mindflayer thralls.
And that is why it is so impactful to rise above all of that if you decide to go for a redemption arc.