Castus:

He is a Calamitous, a being of Supreme Light. He is obsessed with collecting the "other parts" of his being to become a whole person again and return to his family.
Castus does not know about Cecil, though Xilec does. He aims to capture them all becasue, last he remembers, his mother was pregnant with a sibling... he feels guilty for going back to his mother's home world - Hallow Bastion/ Radient Garden- and leaving the unborn child behind to be abused by their father.
Castus always wears light colors. His hair is pale blue and he wears glasses. His eyes, like the eyes of all Calamitous, are amber yellow.