Prayer first appeared in Mobile Suit Gundam SEED X Astray as a young boy with strong spatial awareness. He is also the pilot of the experimental ZAFT DRAGOON-use suit YMF-X000A Dreadnought Gundam before he died due to genetic complications caused by cloning.
Prayer's origin, who cloned him and why, are a mystery. His appearance is similar to the children of Al Da Flaga, and when he was alive, Prayer suffered from painful effects of his genetic flaws like Rau Le Creuset. On one occasion, Prayer has a memory of piloting TS-MA2mod.00 Moebius Zero mobile armor, but it is unclear whether this is his own memory or a vision he received from a pilot in the Moebius Zero corps, which consisted entirely of people having high spatial awareness, including Da Flaga's natural-born son Mu La Flaga. On another, he saved Morgan Chevalier from death by sending a psychic message. Also, it appears that he was under the tutelage of Reverend Malchio, who called him "The Son of Destiny".
Prayer was dispatched by Reverend Malchio in July CE 71 to take possession of the dismantled YMF-X000A Dreadnought Gundam and bring it back to Earth, so that the Reverend can use its N-Jammer Canceller technology to end the energy crisis on Earth. Unfortunately, the N-Jammer Canceller within the suit is stolen on the way by Serpent Tail, who has been employed by Siegel Clyne with the task of ensuring the dangerous technology is used correctly. After confirming that what Prayer did is not against Siegel's wish, Serpent Tail returns the N-Jammer Canceller.
Prayer fought several battles against Canard Pars and his CAT1-X1/3 Hyperion Unit 1; Canard himself is considered a failure because he is the only failed "Ultimate Coordinator" "prototype" to survive. In their final battle, the Hyperion Unit 1 is destroyed, but Prayer protects Canard from the explosion of Hyperion's nuclear reactor. Unfortunately, Prayer later dies from the effects of his failed cloning. In Mobile Suit Gundam SEED C.E. 73 Δ Astray, it is shown that Prayer was with Matias before going to Reverend Malchio.
He reappears as an apparition (or more likely as a Carbon Human) in Mobile Suit Gundam SEED Destiny Astray. His first appearance was meeting Setona Winters while she was traveling around. Later, he also appeared to guide the lost Yoon Sefan and then seen communicating with Kazahana Adja. He had later shown up to Canard in his sleep, and was presumed to be the one who called Lowe back from Mars to halt the drop of Junius Seven. When Canard was about to shoot down one of the terrorists out of rage, his spirit appeared to calm him down.
Prayer makes a small appearance in Mobile Suit Gundam SEED Destiny Astray B as a high ranking member of Librarian Works and is a Carbon Human. He entrusts one of the Lily Thevalley clones, who is previously with the Flash Brigade, to Dante Gordigiani. Since the story of Seed Destiy Astray B take place around the same time as Seed Destiny Astray, it is very likely this Prayer is also the one who appeared in Seed Destiny Astray.
The Carbon Human Prayer reappears in Mobile Suit Gundam SEED VS Astray as a prime member of Librarian Works. This Prayer's aged appearance is due to the original's genetic "defects" (short telomeres), which were reproduced in his new form as rapid aging. This Prayer also knows Matias, as he wears a coat similar to one worn by Matias and has a picture of his younger self together with Matias in one of his rooms. Although he holds a high position in the organization, he does not agree with its goal and works secretly in the dark to sabotage its plan. Apparently, he dislikes the creation of outstanding soldiers/MS pilots using the Carbon Human techniques, and wants to show that the Carbon Humans are not as perfect and useful as their creators intended. Carbon Human Prayer later reveals in the end of the story that due to rapid aging his days are numbered. The Carbon Humans (possibly including Prayer) were then transported to Mars by the recommendation of Lowe's group.
In SD Gundam G Generation series and Gundam Wars card game, due to a more user friendly setting, he is listed as a Newtype instead of a different ability of spatial awareness. Nevertheless, this is not the official story settings. Prayer has also made his Super Robot Wars debut in the Nintendo DS game Super Robot Wars W.
Prayer also appears in Gundam Evolve 6. He experiences a nightmare vision of what would happen if he lost control.
- The connection between Prayer Reverie and Mu La Flaga is even strengthened by the fact that both Prayer and Mu have exactly the same base stats in Super Robot Wars W. Additionally, Prayer is able to pilot Mu La Flaga's TS-MA2mod.00 Moebius Zero and Mu is also able to pilot Prayer's YMF-X000A Dreadnought Gundam.