Citan Uzuki (ウヅキ・シタン, Uzuki Shitan) is a doctor who lives up the mountain path from Lahan with his wife, Yui, and his daughter, Midori. He is a Third-class Solarian born in Etrenank, and his real name is Hyuga Ricdeau (ヒュウガ・リクドウ, Hyūga Rikudou). While in Solaris, he had a troublesome life, until he was accepted to the Jugend Military Academy thanks to his high intelligence. While there, he met Sigurd Harcourt and Jessiah Black. He then became a member of Jessiah's group (The Elements), along with Sigurd and Kahran Ramsus. Eventually, Sigurd and Jessiah left Solaris, Ramsus was promoted into a high Gebler Officer, and Citan was appointed as a Solarian Guardian Angel. As a Solarian Guardian Angel, Citan carried out orders given to him directly by Emperor Cain and the Gazel Ministry. Later, he led an assault mission to Shevat. There he fought with Yui; however the two fell in love, and there was some possibility that Hyuga ordered the retreat from Shevat partially because he had fallen for Yui. Since then, Citan promised Yui's grandfather, Wiseman Gaspar, to never use a sword to kill again. They then got married and Yui gave birth to their daughter, Midori. Citan later received instructions from Cain to watch over Fei (The Contact) to see if he would bring relief or destruction, which is when he assumed the name Citan and moved with his family to Lahan. He reports to Emperor Cain a few times over the course of the game. However, on the outside, he appears to be Fei's guardian and not a Solaris spy. His allegiance toward Solaris will shift completely during the course of the story. As a character, he harbors a great enthusiam for technology and possesses an acute intellect when thinking through complex problems, such as the invasion of Merkava (the physical structure of Deus). He has a strong sense of morality, and would never break a promise under nearly any circumstances; however when the situation deteriorated for the worse, he takes up the sword again with the approval of Yui; arguing that "This is no time for moralities".
Game-wise, Citan's first gear is Heimdal. Later on, he returns to his Omnigear named Fenrir, which is aligned with the Anima Relic Asher and equipped with a large sword. It was kept in Gaspar's care 'in case of emergencies'. On foot, Citan is one of the best fighters in the game, first displaying a blindingly swift hand to hand combat style and, upon regaining his sword, a sword style similar to that of Iaido. He also has a large library of support Ether (his particular Ether talent is called Arcane), which is appropriate to his role as a doctor. He joins Fei early on in the game and stays with him until the end.