How should I write a villain with dementia?
This is really just for a DnD sort of rpg thing I’m hosting and playing with two friends. One of the main villains has dementia. In their story that I have planned they get diagnosed with it while they were quite young, and made a “deal with the devil” in order to get the disease cured. They wear glasses that keep the disease from taking over as in reality it has progressed to such a degree that there’s no more of the character actually left within the body, and that the glasses make up their soul. Their goal is to change the rules of the universe so that diseases like dementia could never be possible in humans again, but they’re a villain because the way they go about this is essentially by forcing the universe to “give up” a winnable battle. One that could result in the loss of all humanity anyway. Halfway through the first “boss fight” of theirs, the glasses are knocked off their face and they fully lose it. After the first “boss fight” they go full maniac mode and tear through whole cities. During the second “boss fight” they lose their mind further and at the end of their rope the “devil” in this circumstance takes over and they essentially become the “ultimate lifeform".
Reason I ask any of this is just because I like writing these sorts of characters. While the world could be just downright insane, and the universe and power system just ridiculous, I like writing grounded characters within them. I don’t really know how to write a character that both has dementia and is possessed by a god though without it coming across as offensive to either someone’s experience or my own down the line. I wanna improve my skills. Advice?