Rhea is a character in Fire Emblem: Three Houses and Fire Emblem Warriors: Three Hopes. She is the archbishop and supreme leader of the Church of Seiros. At Garreg Mach Monastery, Rhea can help Byleth increase their rank in Reason, Faith, Brawl, and Swords. She possesses a Major Crest of Seiros. Rhea is what one would expect of a head of a church: benevolent, kind, and compassionate. While she is such to the devout followers of the church and the students and faculty of the Officers Academy, she is ruthless towards those who would oppose the church. That is not to say that she forces any under her service to be devout followers, as she is quite accepting of other people's ideologies such as Shamir and Cyril, but any who oppose the church with violence are responded to in kind, with Rhea labeling her retaliation as justice. When suffering defeats or misfortunes, she interprets it as judgment of the Goddess. However, despite her position and many followers, Rhea is seemingly lonely, with several of her tea time and advice box questions having her admit she wants to interact with others and finds she has little to no time to relax in peace. She is particularly comfortable and friendly with Byleth during her interactions with them, as she repeatedly insists to them throughout their supports to not think of her as Rhea the Archbishop, but just Rhea, believing Byleth is the only person she can talk to as herself.