Seipher, known as Seyfert (セイファート) in Japan, is the final boss of DemiKids Dark Version.
A class of Galaxy that produces spectral line from ionized gas. They are believed to be a similar phenomenon as Quasars, but closer and not as bright.
- DemiKids: Dark Version Final Boss
Seipher is the force manipulating Imperius and absorbs him after he retreats from his defeat at the hands of Akira. It hungers for time, space, and destruction. Seipher questions why Jin hates it when it was created by the power of Light that gave life to Valhalla itself. It changes form several times during the battle itself.
|Light Version - Dark Version - Animation|
|Playable||Jin - Akira - Rand - Gale|
|Non-Playable||Lena - Amy Kashihara - Shin - Drail - Judy - Bul - Guy - Naomi - Lucifer - Darklord - Lord Light - Imperius - Imperius - Quazir - Seipher|
|Rem||Rem Elementary School - Playground - Rem Mall - Rem Park - Rem Blvd.|
|Future Rem||Rem Mall (Future) - Rem Blvd. (Future) - Rem Park (Future)|
|Redwood||Rem Mall (Future) - Sinra Forest - Redwood Town|
|DemWind||Hueyville - Gateway - Wind Valley - Sword Cave - Kibra Woods - Wind Shrine - Wind Gate - Lost Forest - Galin Plains|
|DemCenter||Center Town - Heldun Flats - Dark Palace - Orgel Room - Deep Hole|
|DemIce||Frostville - Polar Wastes - Ace Base - Ice Cave - Ice Temple - Leader Home - Icy Wastes - Luna Prairie|
|DemSub||Peril Forest - Underworld - Annwn Town|
|DemFire||Helkane Peak - Volkanville - Mt. Giles - Myorl Town - Dark Path - Dark Temple|
|DemSand||Valk Desert - Nobleville - Dune Desert - Howling - Light Path - Light Temple|
|Valhalla||Time's Edge - Time Tower - Tower Area - Fanda Plains - Hermit - Duvegs Trail - Hydraville - Hydra Mine - Limbo - Inferno Pit - Foggy Marsh - Lair Area - Rebel's Lair - Jude Plains - Mount Falos - Elysium - Avalon - Rainy Woods - Tyrnanog|
|Terms||Demiloc - Kingloc - Vinecom - DemiKid - Vinecenter - Battlenet|
|Lists||Demons - Skills - Powers - Items|