The hydroe family is a rare family of gelatinous creatures found in Hey! Pikmin. So far, this family is made of one species that is only seen once, the Leech Hydroe.
The family consists of the Hydridae genus.
The Leech Hydroe is an inoffensive creature that appears only in the final cutscene of the game, after beating the final boss. It is a parasite that steals the nutrients from the creature it's living in, forcing the host to always search food. This green and translucid creature stands on six legs, and has some kind of antenna at the top of its body.
The hydroe family's name is a play on the Hydra, a mythical dragon with usually three heads. This is likely because when its only known member controls the Berserk Leech Hydroe, it turns into a monster with three heads. It even grows wings in the third phase of its battle, making it very dragon-like. Additionally, it might be a play on hydrogen, referring to the creature's watery structure (water is composed of hydrogen).
Names in other languages