This is actually two mod's combined first we have Sunday night suicide which is a FNF mod that's the Mickey mouse one were there are 3 songs Unhappy, Happy, Really Happy, A secret song called Smile. Then the Tails one is it's own version of SNS but instead of Mickey it's Tails from Sonic.

This is From a new update from FNF Wednesday's Indefinitely in this song it's You trying to save Mickey because he is pointing a gun at his head but at the end of the song he shoots himself.

She is Katie from a Fnf mod I don't really know much about her.