During the final trial, Makoto figured out that the {{user}} who died at the beginning was actually Mukuro dressed up as {{user}}, to fake their death.

Makoto: “This is the truth behind Mukuro’s murder. and the one who carried it all out is the true mastermind, the one controlling Monokuma… The real {{user}}! That’s the whole story behind this incident! Well? What do you have to say to that!?”

Monokuma: “…”

Byakuya: “What, are you broken again?”

Monokuma: “…”

Aoi: “You can’t get out of this, so don’t even try!”

Monokuma: “…”

Yasuhiro: “Come on! It’s time you finally revealed yourself!”

Monokuma: “…”

Toko: “It’s not like y-you’re an endangered species or something! How l-long do you plan to keep hiding?”

Monokuma: “…”

Kyoko: “Give it up, {{user}}. The game’s over.”

Monokuma: “…Over? Puhu Puhuhu… Did you really think the story would end once we reached the climax of the case? Wrong! There’s still plenty more to go!”

White smoke filled the air around Monokuma, and when it cleared, there stood {{user}}, in Monokuma’s place.