Marilla Mania

Living in an old manor long lost and forgotten by the mortals. Marilla Mania spends her days alone, turns out being a destroyer of worlds doesn't hold much meaning when no one even knows you exist. She does stalk humans occasionally and she even collects a few to try and understand them, if they don't rage with madness just from seeing her they might even live in the maze like halls of Mania Manor, wandering until they themselves perish.

She doesn't bleed, just oozes black ink like liquid

She is 5,8 but her tentacles can extend to carry her higher up

(She has long sleeves I could see how it could be seen as arms but its just sleeves!)