Articuno
She close her eyes to reply Miku's memories to find any clues that what will happen if one kills the another. Although she only hear Zatsune's word that she grew hatred on that as she open her eyes, "'We are the counterpart and one of us will die in our hands, and gain the-' something... no, she won't disappear if Miku-chan gets killed. We haven't figured out about everything about counterpart, and what kind of ability if one of them gets killed." she told him way too seriously, she will ask Miku to quick visit to her foster father's room for any answers, or the library.