This is not another Asta's father theory, it has to do with Licita.

My theory is that, Asta and Vangence's mothers were part of a family with a curse. One imposed on them because they created anti magic. It could be that either an enemy did this to them or it was a direct result of trying to create anti magic.

That would be why Liebe looks like Asta. A kid got caught in an accident [part of this family] many years ago.

The only reason Asta does not have the curse is because he has no magic.

Now they could have created the curse for two reasons. 1 they did it to fight against the devils. 2 it was too get a leg up on other people because they had a low amount of mana.

Honestly I can tell this is a flimsy theory but at the end of the day, I want to know what you think.