Category Monsters is a term coined by Raiburuto to define monsters that have a characteristic in place of "Effect" that appears in that monster's classification, e.g. the Union in "[Machine/Union]".

Toon, Spirit, Union, Gemini, Tuner, and Timeshifted Monsters are all Category Monsters.

Fusion, Ritual, Synchro and Xyz are not Category Monsters.

The term "Category Monster" is used with certain Extract Monsters and their support.

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