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Lumina is the pink female, while Luminous is the blue male.

Trivia:

You can eat the berries that grow on their manes! The berries from Luminous's mane makes your voice temporarily deeper while the berries from Lumina's make makes your voice temporarily higher! The berries are called Heliberries and Hexaberries!

They are joined by the tail, their spines connect so their nervous system also connects! If you hurt the blue body the pink body will feel the pain as well! It's basically two brain stems controlling two bodies that share a spine. It's...weird.

Also No, you can't separate them, it would kill them. There are many fatal arteries near their tails and cutting through their tail would probably end up paralyzing them.