Massive spoilers ahead.

These are mostly ranked on how messed up they are, from least to most.

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5. Kaito Momota : Ultimate Astronaut : Blast Off! Second Ignition

This is mainly ranked lowest because he actually got to see outerspace before he died, and the execution failed because of Kaito's illness.

4. Kirumi Tojo : Ultimate Maid : Strand of Agony

I feel like this plays more on a mental kind of torture than physical - though, there is the saws and the fact that she has to climb up a thin strand of thorns.

3. Gonta Gokuhara : Ultimate Entomologist : Wild West Insecticide

Honestly, his physical strength and endurance is what doomed him in this execution. He faced it like a true gentleman...

2. Korekiyo Shinguji : Ultimate Anthropologist : Cultural Melting Pot

He literally gets boiled to death, then gets a false sense of security when he finally sees his sister before getting salt thrown at him by her and Monokuma. Honestly, Korekiyo's execution is one that's disturbed me the most out of those I've seen.

1. Kaede Akamatsu : Ultimate Pianist : Der Flohwalzer

Apparently her execution lasted eight hours, and she's allowed a moment to breathe every time her weight is on the piano keys. There's also the fact that Monokuma basically mocks the one thing she loves most, and the entire visualization of the execution is horrific, especially at the end when you just see her body hanging there. Honestly, I feel like this execution beats Leon's, in terms of first executions.