You already know how this one ends...or DO you?
A fanfic for the OTHER fanfic (which someone unpublished, idk) "Princess Celestia saves Robin Williams from killing himself."
(No warranty expressed or implied.)
Honestly, if you don't like VERY dark comedy, you should probably just go read this instead: https://www.lbda.org/blog/robin-williams-and-lewy-body-dementia-2/
It's informative!