Setanta was elderly in appearance with brown eyes and grey hair that goes down to his neck. He tended to wears a montsuki haori jacket similar to many of the other members of the tribe.
He strictly followed the law in the village and was shown to be willingly (Albeit grimly) take the responsibility of removing the taboo of twins as an Oni himself. However, he changed his view when Ram unveiled her powers with just a single horn in order to protect Rem. He saw Ram as a child prodigy, and ultimately accepted the Oni twins as members of the village.