Most of the roles are cast by the make-up man on his own authority, but the final choice of the Emperor who will ride at the rear of centipede is left to the temple gods. Three candidates selected by the make-up man are led inside the temple together, and the choice is made by throwing down crescent blocks.
一般角色由化妝師全權決定，然而將坐陣蜈蚣尾的皇帝人選，則由化妝師粗挑三個，再一起入廟內擲筊杯由神明來選定。