Seigen (セイゲン) is the leader of the clan Kuchinawakai.
Seigen has long dark hair along with a mustache and a beard. He appears to have no eyes, with crack like markings around his eye sockets, but has been shown to have them when he looked at Ouji Kimihiko and when he and other clan members fought a Doume. He wears a robe that covers his body, earrings, and a circlet with a snake that represents Kuchinawa.
Seigen is a charismatic leader as he is the head of a new religious movement comprised of 50,000 members. He is also shown to be perceptive, noticing that Kimihiko was targeting him and watched as he ran despite the other members around him not noticing anything. He doesn't seem to like overly secular people, instructing his subordinates to not cooperate with an "evil" man like Kanehira Hideaki.
Sigil: Seigen has an unnamed telekinetic sigil.