At first glance, Nagi appears as kind and caring, especially towards Hikari. Hikari views her as a comforting figure and the only person that she could vent her hardships to, and thus always stands by her. She seems to be able to sympathize with Hikari's hardships and appears to be saddened when she hears of her desires to discard her self.

Voice Reference: There is no english VA for Nagi, so it's up to your interpretation. I imagine a someone deeper tone, but I could be impressed!