Kodi (Bad End) in the noncanon bad ends in the Mentality Fanfic Series.
There are currently two different individual Kodis that hold the title of bad end.
1st: In Bad End 3, Kodi witnesses Neisan falling through the vanishing step in the stairs of infinity.
2nd: In Bad End 4, Kodi and the others fall down a trapdoor into a large room. However, upon landing, Kodi mysteriously vanished.
See: Kodi Kazoku