After the killing games, some of the survivors gained fears (or basically PTSD...)
Makoto: Trust issues (due to what happened with Sayaka)
Aoi: Attachment issues (doesn't want to get attached to people, knowing they most likely will die)
Yasuhiro: Trust issues (due to Celeste trying to frame him for murder)
Hajime: Fear of corruption (he's scared he'll become Izuru again)
Fuyuhiko: Fear of being alone (because he lost Peko)
Hiyoko: Fear of the unknown (because of Chapter 3)
Gundham: Fear of being trapped (the Funhouse)
Shuichi: Attachment issues (because of Kaede)
Maki: Fear of loving again (because of Kaito)