She can't refine Mana into Arcana like other mages, so the only way to get energy is to use her unique ability to absorb the refined Arcana from casted spells/abilities and turn it into her own power. 

The mysterious resident inside of Naya's head. (?)

Though she acts quite immature and enjoys teasing Naya, she has vast knowledge of the world and will sometimes offer guidance to Naya.

Lia will sometimes have a minor slip-up and say some odd things that could lead to her origin but will refuse any attempts at gleaming more.

She desires the Devil essence released by witches when they die.

A Paragon of Sanctum, a human mage organization. 

Similarly to Lia, she enjoys seeing the various reactions Naya has to social situations. However, she takes on a more motherly role in that she seems to show concern for Naya.

Lia has said that Sophia is probably one of the strongest humans alive, though that information can't be verified.

She was unknowingly painting the victims of a Witch before Naya found her and offered to pay her more to get her to leave. Now, she journeys with Naya to pursue her own goals. She claims to want to make amends and has each painting she made for the With stored, but she hasn't made any concrete plans with them.

Naya found herself wanting to protect her because they shared similarities.

Easily excitable, enthusiastic, and mischievous, she creates a great counterbalance with Naya's stoic nature.