A Honkai Impact 3rd character. Theresa Apocalypse is a clone (dubbed as A-310) made by Otto Apocalypse using the genes of a Houkai beast named "Vishnu" and Kallen Kaslana's DNA in an attempt to bring Kallen back. As a test body, A-310 has excellent Houkai resistance and strong powers. She was born on March 28, 1972.
Being a part of the 260 A-E series, A-310 did not know her identity and Otto told her that he would tell her anything she needed if she completed the tests. At the final test, A-310 was told by Otto to defeat A-303. A-310 did not want to kill A-303 but was forced to, and had successfully put the clone out of its "misery". As a result, Otto believed that A-310 could potentially be Kallen's reincarnation due to the empathy she showed, along with her incredible combat capabilities. However, he stated that science is different from reincarnation. Otto would later adopt A-310 and call her Theresa.
Otto later gave the 11th God Key, "Oath of Judah" to Theresa.
During the events in Honkai Impact 3's storyline Theresa Apocalypse is the principal of St. Freya Academy and the World's Cutest Valkyrie (in her words).
Theresa has several Valkyrie forms available: Valkyrie Pledge - Universal Valkyria uniform used by the Schicksal in the early days closely resembling a nun outfit. Sakura Rondo - Sports a "miko" look while also possessing fox ears similar to Yae Sakura. Violet Executer - Opts for a fully functional battlesuit to assist in pounding her enemies to smithereens. Celestial Hymn - Dons a holier outfit that looks very similar to an ornamented wedding dress. Luna Kindred - Swaps out everything for a flamenco styled outfit with a noticeably vampiric constitution. Twilight Paladin Starlit Astrologos
