Julio

"This is an experiment. A very enjoyable experiment!"

Julio is a villain from Kira Kira☆Pretty Cure A La Mode. He's the one behind the Kirakiral thieves, and he starts attending Ichika's school in disguise to get closer to her, using the name Kuroki Rio. He performs a variety of experiments about Kirakiral. He seems to enjoy his experiments a great deal.

Abilities
Using the rod he has, he can drain the Kirakiral from others, with which he can use Noir Decoration, which turns his rod into different types of weapons.

He seems to have some sort of mind control or corruption ability, which he used on the Kirakiral thieves.

Etymology
Julio is a Spanish variant of Julius, although this is based more on the spelling of his Japanese name (ジュリオ) than the pronunciation, which is closer to the Italian version of the name, Giulio. Julius may be derived from Jupiter, which comes from Zeus, which derives from a word meaning "sky" or "shine".

The surname he chose for his alias, Kuroki (黒木), contains the kanji for "black" and "tree". The tree part may seem random, though he does seem awfully fond of sitting, napping, and just standing in trees.

The given name he chose for his alias, Rio (リオ), doesn't have a clear meaning and was likely just chosen to go along with Julio, which is ジュリオ (Jurio) in Japanese.