Lady Rhea is the archbishop and supreme leader of the Church of Seiros.

Lady Rhea is what one would expect of a head of a church: benevolent, kind, and compassionate. Her benevolence extends especially to those devout to the church. As a notable figurehead for the Officers Academy, she enjoys watching the students grow and encourages her professors to be a guiding figure for the future figureheads of Fódlan.

However, despite her position and many followers, Lady Rhea is seemingly lonely, with her admiting 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 Casey during her interactions with them, as she repeatedly insists to them to not think of her as Lady Rhea the Archbishop, but just Lady Rhea , believing Casey is the only person she can talk to as herself.

Despite her compassion and kindness, Lady Rhea is ruthless in wake of those who endanger the church as she does not hesitate to sentence the rebelling Western Church leadership with death for their insolence. She can be unsettling in this regard though as she calmly issues these orders. However, she remarks that these are merely judgements of the Goddess and that their deserved fate are merely punishments.