Miaka Yūki (夕城 美朱 Yūki Miaka), the primary protagonist in Fushigi Yûgi, is an ordinary 15-year-old junior high school student. She initially decides to become the Priestess of Suzaku (Suzaku no Miko) in order to ask Suzaku to grant her wish to join her best friend, Yui, at the same high school.
Miaka falls in love with Tamahome: this motivates Miaka to gather the seven Celestial Warriors of Suzaku and summon the god Suzaku Seikun. Though Miaka's final wish as the Priestess of Suzaku had been for her and Tamahome to remain together forever, she chooses instead to ask Suzaku to save "this world" (Miaka's world after being destroyed by the battle between Seiryuu and Suzaku) and restore it to the way it was. Her warriors are shocked and even comment on how "so completely selfless" it is. Tamahome is then forced to return to his own world because of it. However, when Miaka enters high school, she meets Taka Sukunami who is Tamahome's reincarnation and shows her the wedding ring she gave him. In Fushigi Yugi Eikoden, they are married. She is the victim of Mayo (a younger student)'s jealousy because she is the receiver of Taka's feelings. When she becomes pregnant Mayo enters the book to change the course of the story, causing Miaka to fall unconscious. Knowing that the world in the book is in danger, Miaka sends her unborn child into Mayo as a chance to connect with and save that world. When the false Suzaku is summoned, she uses her connection to seal him away and give Taka the strength to defeat him. Soon after, the conflict is resolved and she wakes up in her own world with Taka by her side. She later gives birth to their son, whom she names Hikari.
Outgoing and optimistic, Miaka shows herself amiable with friends and strangers, and has a tendency to be guileless and sentimental. She is naïve, but sometimes surprises adults with an insightful comment. Miaka is generous and cares greatly for other people and perceives herself to be a considerate person. She can be unassuming and unsophisticated, but also magnanimous and courageous. Because she creates the impression of a person who always needs help, Miaka has the good fortune of almost always having someone looking after her.
Miaka has a primary weakness: her gluttony. She eats constantly and has an interest in any type of food. She is an avid fan of anime, imitating several characters during the course of the story.
Tamahome (鬼宿) is the first of the seven Celestial Warriors of Suzaku to be introduced. The eldest of five siblings, Tamahome is seventeen years old and was born in Hakko Village in the Juusou Prefecture of Konan under the star Demon (鬼). He is first introduced when he saves Miaka and Yui from slave-traders. He immediately asks for payment for his services, but is turned down. He later saves Miaka from another gang of slave-traders when she arrives at the Capitol.
Tamahome appears to be the strongest member of the Suzaku warriors. An adept martial artist, proficient unarmed and with weapons, he proves a good street-fighter and can channel his chi into energy-blasts. When emotionally motivated, he is able to use his chi to increase his strength, speed, and reflexes in combat. Tamahome is also experienced in fencing thanks to being trained by Tokaki.
Initially, the story portrays Tamahome as a greedy young man obsessed with money, interested in helping others only if it means getting paid for it later. It is eventually revealed that his interest in accumulating money derives from trying to support his family. He comes across as cheerful, vain, and comic, but is actually shy and emotionally strong. Throughout the series, he demonstrates himself to be a sincere young man who is willing to sacrifice himself for the sake of others and unwilling to back down from enemies. In the 7th volume, his family is massacred by Suboshi.