Ina is good so long as she keeps the power of the AO tamed. If she becomes too upset then she loses that control and becomes essentially possessed. That is why she is normally quiet, yet polite. She brings followers into the cult because she believes she can keep that control and harness the power for benefit.
Every Myth girl has a drawback: Gura going feral, Kiara releasing her full Phoenix form and being destructive, Mori losing sight that her role is to keep the balance of life and death, Amelia using the concoction or her watch too much. But Ina's feels especially dangerous due to the nature of the cosmic and psychological aspects of her power.
