Cristián Alvarez

 was a human psychic. He obtained the ability to see the Blue after taking LSD in 1968. When the Doctor took him to the RMS Titanic before it sank to retrieve the Codex Atlaca, Huitzilin attacked and drained the Doctor's life force, making Huitzilin fully corporeal. Cristian grabbed a gun and shot Huitzilin, killing him and returning the Doctor to life. (PROSE: The Left-Handed Hummingbird)

Cristian was one of the guests at Benny and Jason's wedding in Cheldon Bonniface. (PROSE: Happy Endings)