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Guaiwaru is a devilish man who has green colored skin with orange hair, a pair of red horns, thick purple markings under his eyes, and a scorpion-like tail. His attire consists of a dark red coat, orange shirt with a black cross on the front, black pants and brown boots.
Guaiwaru is a rude devilish man with fearsome brutes and a hot temperament, preferring to resolve problems with violence. He also likes inciting arguments and fights for his own amusement.
- Shindoine - Guaiwaru enjoys taunting Shindoine by mocking Shindoine's love for King Byogen, and finds it fun when she throws a tantrum in response.
Guaiwaru attacked for the first time in episode 4, targeting the Light Element and turning it into a Megabyogen. After witnessing the birth of Cure Sparkle, he began to consider her his archenemy before he retreated.
- Guaiwaru can create a Megabyogen by using a tiny spherical bat-like demon summoned from his armpits to possess an Element Spirit.
- He shares his voice actor with the Bull Demon King from the Smile Pretty Cure! movie.