For me, it would be GLaDOS.
Portal 2 spoiler
She deleted the one remaining human part of herself because it was just too much to deal with. She releases you at the end of Portal 2 as a path of least resistance measure because “killing you is hard.”
What about you, what is your favorite media villain?


Prince Arthas Menethil from Warcraft.
[Quietly sweeps WoW:Shadowlands under the rug]
Dudes villian arc is perfect, his fall is entierly of his own making. Playing as him in Warcraft 3, you follow his reasoning and by the time the corruption sets in, its far too late. In the expansions, you play as him in full BBEG mode. Lastly, WoW:Wrath of the Lich King had him as the capstone boss of one of the best expansions and 15 years of buildup.
And they never expanded on his character ever again…
The Warcraft movie should have just been WC3.
With an extended edition bordering 4 hours, like LotR
Sure, but they just needed a story compelling to people completely new to the ip for the first movie if there was ever going to be a second.
Best cinematic cut scene ever. Succeeding you