Sylph located in Kaleo Mountain.
Gnome located in Lost woods.
Undine located in Tobi lake.
Salamander located in Krakatoa Volcano.
Lexar he not spirit but he the one who manage to gather them all by accident.
Sylph: Noisy and say whatever she like without thinking, she also big talking but doing nothing.
Gnome: Silent and almost say nothing, she also like to doing than talking.
Undine: Sad lunatic, she is tragedy freak, and always over dramatic everything.
Salamander: Wild spirit, she is battle maniac, and always pick fight with Undine.
Lexar: He believes he are a hero who act for good of the world and of the people.
PS: if you have anything in mind let me know, but I'm might late to read it since I'm "Late Hero".