Arasaka is not a known canonical character in Genshin Impact. If you are referring to a fan-made or mistaken name, there is no official full name or role in the series to match. Genshin Impact is a fantasy action RPG by HoYoverse set in the world of Teyvat, and its story follows the Traveler as they explore regions, meet allies, and confront powerful factions. If you meant a different character, please provide more details so I can identify the correct one.