Power Rangers Omega Factor

Plot
Twelve cosmic warriors, embodied into human youngsters, are called upon the Yggdrasill tree - heart of the Dipper Mother - in order to save the universe from the impending Ragnarök. They are fated to awaken their Zodiac power once again, becoming the Stellarknight Rangers.

Villains

 * Nidhögg (main antagonist, arc 1)
 * Garnet Salamandra
 * Obsidian Sphinx
 * Cobalt Echeneis
 * Jade Ouroboros
 * Amethyst Unicorn
 * Rhodonite Raven
 * Velgr (main antagonist, arc 2)
 * Argon
 * Krypton
 * Radon
 * Xenon
 * Apsu (main antagonist, arc 3)
 * Shamash
 * Sin
 * Nergal
 * Nabu
 * Marduk
 * Inanna
 * Inurta

Trivia

 * For the Power Ranger roster of this series, the author intended to use the twelve Zodiac signs, but made an exception, due to constellations in general being notorious as well.
 * Furthermore, the fact of some Rangers being named after stars, and others after Egyptian/Greek-Roman deities gives this series a Saint Seiya vibe. Here is the meaning of the Stellarknight Rangers names:
 * Regulus: the key star of Leo constellation.
 * Markab: the key star of Pegasus constellation.
 * Sirius: the key star of Canis Major constellation.
 * Atalanta: a heroine from Greek myths.
 * Ajax: a hero from Greek myths.
 * Callisto: a nymph from Greek myths.
 * Eltanin: the key star of Draco constellation.
 * Agamemnon: a hero from Greek myths.
 * Styx: a nymph from Greek myths, daughter of Okeanos and Tethys.
 * Minos: a Greek demigod, first king of Crete.
 * Tethys: a titaness, mother of the Oceanids.
 * Isis: an egyptian goddess firmly worshipped throughout the Greco-Roman world.
 * Cynara: in Greek myths, a lover of Zeus.
 * Hyperion: A titan, and byname of the Sun.
 * Juno: Equivalent of Hera in Roman myths.
 * Serleena: a corruption of Selene, the Greek goddess of Moon.
 * The Dipper Mother, home of the tree Yggdrasill, is based off of the Ursa Major constellation, visible at the Northern Europe.
 * Serleena, the Phantom Ranger, is based off of Selena Gomez. Nevertheless, in order to shun legal issues, her name had to be twisted.
 * The Talisman Rangers are based off of the Outer Senshi from Sailor Moon franchise.