Squall: He hates himself and ends up killing himself.
Rinoa: Since Squall died, she jumps off a cliff.
Seifer: Kills himself so he can fight Squall in Hell.
Zell: Chokes on a hotdog.
Quistis: Accidentally strangles herself with her whip.
Selphieoes to Trabia and trips over a rock and lands on a spike.
Irvine: Wonders where Selphie is and goes to Trabia. Ends up lying accidentally on the spike.
Fujin: Goes into stealing and gets caught, so she kills herself in prison.
Raijin: He goes fishing and a fish drags him into the water and drowns him.