Minamoto no Yorimitsu
Seimei appears as an NPC in the video game Nioh 2. Despite being from the Heian period, he strangely appears during the Sengoku era to train the players in the art of Onmyō magic. It is later revealed in the DLC "Darkness in the Capital" that this individual was actually an avatar created by the real Seimei, who had sacrificed himself alongside Minamoto no Yorimitsu to seal away Shuten Dōji and Tamamo-no-Mae within Byōdō-in during the Heian period.