Yamiyo

Yamiyo (ヤミヨ) is one of the members of Blackmare. He appears in episode 1 along with Jakuchi. He ends most of his sentences with "~Sad."

Power
He can transform the colorful hearts (especially the blue hearts) into a black heart to turn the man into a monster.

Trivia

 * He is the sixth villain to end his sentences a certain way (in this case, it's "~Sad").
 * Yamiyo is the second villain whose age changes, preceded by Majorina from Smile Pretty Cure! and Lock from Go! Princess Pretty Cure.