Saiark

Saiarks (サイアーク Saiāku) are the main monsters of Happiness Charge Pretty Cure! and are made from the dark reflections of people's souls. They are usually summoned by the generals of the Phantom Empire when they find a likely victim. If the Cures fail to defeat the monster the person can be stuck like this forever trapped in a dark mirror.

Appearance
The monsters appear as large minions of the generals usually taking on a trait or two of the victims darkness.

Trivia

 * "Saiark" appears to be translated from terrible or worst.
 * These are the first monsters to gain energy from humans, when they're having no negative feelings.