The Cosmic Era
The Cosmic Era has incidents during which human beings are compromised, mutated, or otherwise severely altered by the strange energies and anomalies that boil up during dimensional fatigue events. The technical term given to these individuals is 'Wight'. They retain their human appearance but develop inhuman abilities, with the most common being supernatural durability. Most Wights are able to ignore anything less than military grade hardware. Enhanced strength, parapsychic abilities, and strange biological adaptations (tentacles, new orifices with alien teeth, claws) are also present.
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The Wights that are spawned in the Cosmic Era do not follow the trope of shapeshifting into monsters, and maintaining two forms. If a wight manifests a new more horrific form, that becomes it's new form. The standard Youma is based more in the anime tradition of transforming monsters, but also functions in a much more magic setting.