Well, no, Basically yuno was "Sort of" a character but there were no future diaries.
BUT YEAH, I'M A GENIUS.
Short Stories in which you don't witness the MC's bloody, gruesome death from their perspective are trash really.
I wrote a different one about Mewtwo one time, where instead of burning the labs and escaping, it burned the labs and KILLED EVERYONE including Giovanni.
This was for school,
But instead of mewtwo, it was just a crazy mutant-alien-monster thing.
TRHS