Yes it should be Hai Tien, changed the tag accordingly. Hai Chi is her sister, another girl being added now (that was already shown on CN weibo, but not on JP or EN twitter yet). They are also alternatively Romanized as Hai Tian and Hai Qi respectively, but I assume EN will use the former versions.
Light CruiserWhen will the flames of war finally be snuffed out?"War stains the land for a thousand miles, bullets salting the earth in its wake."...Hai TienVA: Date Arisa