Poke's natsuki christmas template

Murder mystery involving people with pink blood

16 ultimate students, all with a special talent, forced to kill each othwr

a buncha kids get trapped in a school (second game island, third game idk) and they have to kill each other and have class trials in order to escape

So only 1 survives?

no more than one of them end up surviving for different reasons
pretty much 5-6 ppl make it out alive

oh yeah and they all have talents called "ultimates" such as korekiyo shinguji being the ultimate anthropologist, or nagito komaeda being the ultimate lucky student in game 2

death and betrayal

That, doesn't really help