My supernatural being needs more consistency!

So, here it goes: I have in mind a supernatural being, similar to a spectrum, and my character (who is human) will have to fight it.

It is supposed to be dangerous and scary and therefore the fight should be able to translate it, along with the fact it has a supernatural nature.

I thought about shapeshifting into the loved ones, but it sounds cliche... I'm stuck and I can't get pass this.

Please help me with some directions, so I can get inspired to create a being who is interesting. This fight must stand out, in a way...

Thanks !!