SINCE WHEN WERE YOU THE ONE IN CONTROL?

Chara Masterpost: starryoak.deviantart.com/art/T…
The design for Ghost!Chara is based off, obviously, Chara's revelation in the penultimate scene of the Genocide run if you choose to disobey Chara's wishes., but also off of this theory. I didn't have, well, the stomach to look up mummy skin colors (do not search for recently mummified bodies if you value your sanity....). Their clothes are much more frayed than their living form, and their clothes have the color of their skin, though their current skin tone as a ghost is paler than it was in life. The painted on blush to give the illusion of life only hurts the impression of humanity. There's something of a dichotomy I tried to give their look, simultaneously human and yet inhuman. The leaking black eyes... well, um, read the mummified explanation. It leaks down their face and helps their 'scary face'.
Chara's soul was released when they died. And bound back to their body, they experienced the mummification and wrapping, in the cold coffin they were placed in before their mother, Toriel, took them.... and buried them deep in the ruins, planting a flowerbed over their burial place. There they lay for hundreds of years, holding their hatred in as their body decayed, refusing to let go. Asriel's betrayal had convinced them that they couldn't trust anything in this world. Nothing was worth living, neither monsters nor humans. Monsters couldn't be trusted. They let you down... And so their hatred continued to fester, until one day... another human fell onto their bed.
Chara in this form is able to see everything... in the cavern of their coffin. They are much more... demented than they were when they were alive, spending over 600 years in one room will do that to you. This form is where they spent most of their life, and when they formed their decision to kill all monsters and humans, to erase the world. The famed line, the titular one, is not said to the player. In my headcanon universe ('Overtale' when it reaches the pacifist run ending is the name) Chara is the player, or at least, is the one controlling Frisk during the Genocide Route. They say this more to no one, when they erase the world, turning to nothing and, in defiance to the long forgotten God that their village claimed condemned them from birth, ask if He is really the one in control. He rejected them, and now His world is dead. Who is He to condemn them now? They're in control. And if He exists, He is powerless to stop them.
As a ghost, Chara can only possess those who accept them into their body, so they were only able to possess Frisk when Frisk accepted their offer of 'guidance' to the surface.