Carole Arna is "the Creator". At the end of Season 2, she'll lead the proxies to go find professor Arche deep within Hollow Zero. The various "training" set up by the mayor and Shifu was all to prepare the proxies for Hollow Zero. Arche, Helios Academy's founder reveals the school's main purpose. To research time loops the secrets of Hollows. With Arche's help he requests the proxies to go back in time and save his old comrades (the dead void hunters). Just like anons predicted from 1.0, the 2 proxies travel back in time.
This is how mihoyo plans on making the Honkai expies playable and marketable.