Mr. Froste is the father of Sera and the husband of Mrs. Froste. In the universe Sera grew up in, she never knew her parents, but had Remnants about them. After The Iron Empire, he and his wife are saved and are in Sera's house when she returns.

In the Books

In The Trap Door, during her trip to the Cataclysm, Sera saw her parents dead, implying that Mr. Froste and his wife came back for their daughter.

In Behind Enemy Lines, Tilda tells Sera that her parents are SQ. This is confirmed in Eternity. Mr. and Mrs. Froste also have showed that they implanted Riq's Time Travel Chip.