LIGHT monsters are the historic opposites of DARK Monsters. "Blue-Eyes White Dragon", the components of "XYZ-Dragon Cannon", and monsters such as "D.D. Warrior Lady", and "Honest", are LIGHT monsters. LIGHT monsters are represented often by Fairy, Spellcaster, Thunder, Machine and at times Warrior-Types, but in general, they encompass a wide array of monsters.

Some LIGHT cards focus on overwhelming offensive power, such as the "Blue-Eyes White Dragon" and the fusion forms of "Cyber Dragon", but others focus on positively reinforcing the player instead of directly damaging the opponent, such as by increasing their Life Points or allowing the player to draw extra cards from their Deck. LIGHT monsters will in general either be highly offensive or highly defensive with little middle ground. In Decks themed around multiple Attributes, the trump card of the set will often be LIGHT, such as "Rainbow Dragon" for the "Crystal Beasts", "Elemental HERO Shining Flare Wingman", and "Elemental HERO Neos" in "Elemental HERO" builds, and so on. Some LIGHT monsters almost always reveal your strategy due to the follow up that would happen if the strategy succeeds in being used.

Notably, the Attribute of the Monsters do not necessarily indicate any sense of morality; such monsters as the Aliens and Arcana Force are antagonistic beings according to card lore or the anime, which also features an evil entity of LIGHT.

LIGHT-based archetypes include: "Arcana Force", "Batteryman", "Fabled", "Hieratic", "Holy Lightning", "Lightray", "Lightsworn", "Ojama", "Photon", "Galaxy", "Constellar", "Vylon", "Bujin", "Watt" and "Worms.

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