LogFAQs > #928669196

Ok so I read Nagito's free time dialogue.

Damn. It seems he is cursed to have a stroke of extreme bad luck, followed by good luck, over and over. His parents are dead, but he is a millionaire. But he has terminal cancer and dementia. So it makes sense that he decided to end his life by giving it all to create the Ultimate Hope. Because his luck can just get him there. And look, it may have worked out in the end, since the DR2 cast did some impossible things.

So I guess Nagito is cheerful in Despair arc because he hasn't come across an opportunity to create havoc yet, which he got in the DR2 game. He'll probably get one soon though, thanks to our friend Junko.