Mickey Mouse, or known in this mod as Suicide Mouse, is the main protagonist of the creepypasta of the same name.

Story A few weeks prior to his encounter with Boyfriend, Mickey finds out that Minnie had an affair with Pete, and divorces her. On top of that, Goofy and Donald got into a fatal car accident (Goofy took the exit lane when he should have taken the enter lane), and Pluto was infected with rabies, so he had to be put down, leaving Mickey with no one. Alongside having to deal with all this stress and loss, he had to force himself to keep smiling and having fun in his cartoons, so that kids would keep watching, causing his emotions to become bottled up. Eventually, he decided to take a walk, thinking some time to gather his thoughts might help.

More facts here: https://fridaynightfunking.fandom.com/wiki/Sunday_Night_Suicide