you previously made that Liam wanted to make mental enhancements, so maybe he could use this technique to safely observe his mental scales?

Can Liam possess someone or make a clone of himself if he uses the technique he used to revive the kitsune on himself, because judging from what I understand, he can transfer just a little bit of his mental energy at a time and could change the other parties mental scales to match his own, then he could transfer the mental energy back to himself and basically have a mental clone?(without the triumvirate body or other unique abilities, of course) What are the limits of that technique? can he control other species, or just other people with the triumvirate body, or squids, humans, and Ashuras separately? can he control someone else's centers of power?

It does, but he doesn't become a good person

He could also apply the purification and absorption runes to his teeth for when he eats people.

and Liam can turn the runes into part of his anatomy by using expel like how he did in chapter 377-378