These are actually included in Hybrids, but unlike them, they are naturally made through cross-breeding.

Youkai monsters are divided into two types; the ones that are fully monsters (mainly mythical) and the ones who ate hybrids of Youkai and Monsters.

The normal monsters are the ones stated in myths, like the Minotaur, Sirens and Nemean Lion.

The hybrids, on the other hand, are crossbred and thus their names are a mash of its two parents. Some examples include but are not limited to the Nemean Blazion, Croko and the Minotennou (Minotaur x Sutoku Tennou).

Like Youkai, they use medals and a watch to summon when in need of help. However, they are much more difficult to tame since most Youkai Monsters are rowdy and wild.

Midoriya Izuku is their only known acknowledger.