Nonhuman x Nonhuman

Crow x Wolf. She's a crow and can shapeshift into a human form, and he has divine beast wolf blood, meaning that he is in human form until he has 'awakened'. After that, he can shapeshift whenever he wants to.

Dragon x mouse - he's a dragon and she's a mouse

Wolf x rabbit

Fox spirit x rabbit spirit

God x God

Dragon x witch

Dragon x mermaid

Archdemon x elf - I think he's an archdemon, because, it's in the title, but he might be human. However, she's an elf.

Elf x elf

Devil x siren