diamondo | AUs

1 - Sole Survivor
Case 2 never happens. Instead, Togami kills Chihiro in order to hide his secret. Kirigiri is able to solve the murder and Togami is executed. Case 3 is basically the same, only Aoi is killed instead of Ishimaru. That leaves Sakura, Fukawa, Kirigiri, Naegi, Hagakure, Ishimaru, Mondo, and of course the mastermind, Junko. In an attempt to make sure someone graduates, Ishimaru poisons everyone but himself and Mondo, then confesses to the murders. Junko has no choice but to execute him and let Mondo graduate. Mondo attempts to inspire hope in what's left of the survivors.
1B - Alternate Survivors
Fukawa, Kirigiri, Naegi, Hagakure, Ishimaru, and Mondo all make it to the end of the game, where Junko reveals the truth about the outside world. She threatens to kill Naegi if they can't all unanimously agree on leaving. Either they get hope-beamed by Naegi or Ishimaru votes to stay to ensure their safety.

2 - Mastermind
In which Mondo is the mastermind. He has two moles: Sakura and Ikusaba. The cases proceed exactly as canon, except Junko is killed instead of Ikusaba. Mondo's execution is instead a clever disappearing act thanks to a trapdoor in the floor and perfect timing. Prior to his execution, Ikusaba was controlling Monobear. He kills her after his "execution." Case 3 is mostly the same, but instead of Ishimaru dying, Togami is killed instead. Case 4 is exactly the same. Case 5 proceeds the same way, with Naegi being blamed as the culprit, but surviving thanks to Alter Ego's interference. Finally, the remaining students (Naegi, Kirigiri, Aoi, Hagakure, Fukawa, and Ishimaru) confront the mastermind. Understandably, Ishimaru is horrified (and possibly relieved) to see Mondo again. Mondo finally reveals the state of the outside world (with Genocider Syo's testimony as well) and offers them a choice. They can either stay in the safety of the school, or they can attempt to survive outside. They have to agree unanimously or he'll kill Naegi; if they agree to leave the school, Mondo will execute himself. Unsurprisingly, Ishimaru can't vote against his aniki and Naegi is executed. The remaining students stay within the school's walls.
2B - Masterminds
Instead of Mondo being the sole mastermind, he's working with Ishimaru. Sakura is the mole and Junko and Ikusaba are just unfortunate classmates caught up in all this. Unsurprisingly, Ishimaru and Mondo are the biggest failures and end up getting caught before case 3 happens.

3 - Talentswap
Mondo is the Super High School Level Gambler instead of being a gang leader. His backstory is changed slightly; Daiya was still killed in a motorcycle accident due to Mondo racing recklessly, but there was no gang to impress. Mondo still has issues with strength, but instead of being a punk all the time, he stays just within the legal lines, though he understandably pisses Ishimaru off. They end up bonding in the sauna duel, however. Case 2 goes the same way, only Chihiro is Super High School Level Good Luck and manages to survive, making everything horribly awkward.