Alister Agrew

Alister Agrew (Αλιστρ Αγγρω) (アリスティア・アグリュー, ), or "Alis" to her friends, is Tatiana Wisla's trusted confidant, best friend, and expert navigator. By her nature she is very quiet, reserved, and otherwise unflappable, reacting very little to even the strangest of circumstances. Her only reactions are shown in the way she carries herself, and the quickest way to earn her loyalty is to not dismiss her, or act like she is not around. From her behavior, it is shown that she is a consummate professional, just like Tatiana, which explains why they work so well together. However, she is far more than that, but will do nothing to prove it outright. She has displayed unfathomable respect for Tatiana, a strange attraction to Claus Valca, and even motherly behavior towards Alvis Hamilton.

Alister Agrew's seiyū in the original Japanese anime is Natsuko Kuwatani, and she is voiced by Philece Sampler in the English adaptation.

Source: Wikipedia