ok, the twilight people are the lost tribe of majora's mask since there precious
FS was locked away they were trying to create another item to use for desctruction, but they put to much dark magic into it and created a dark soul that only wanted death and destruction, they locked that away because they didnt want there realm to be lost again, the twilight realm is termina because termina and the twili realm are both a counterpart of Hyrule, the four giants in Termina are the light spirits in
TP,
with the eyes, they fused shadows eyes are squinted, and with majora's eye it is wide open because if you can look closely you can see the line around the eye not on the eye are the same lines.