Kayayday

In the demo version on Danganronpa V3, we hear Kokichi Ouma pronounce Kaede as Kai-a-day when her name is supposedly pronounced Ka-eh-de. Most people believed only Kokichi pronounced it this way until they played the game and heard everyone else pronounce it like this too.

Kokichi: But that's Kayayday's lie, isn't it?

Shoe itchy

Shoe itchy is a joke pronounciation of Shuichi Saihara's (from New Danganronpa V3: Killing Harmony) name. Many people make jokes using his name like Pooichi given to him by Miu Iruma.

(V3 character): Hey Shoe itchy!
Shuichi: Oh my god-

Pooichi

A name given to Shuichi Saihara (New Danganronpa V3: Killing Harmony) by Miu Iruma.

Miu: Hey, Pooichi!
Shuichi: Pooichi?...