Within the order are distinguishing ranks. There are squires, who train to become knights, the knights, who serve as the organization core forces, and the holy knights, the best warriors of the order, who can wield a Hero's Relic.
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A damaged book in the Shadow Library of Abyss titled "Burnt Remnants of a Report" mentions a clandestine group within the Knights of Seiros called the "shadowed order."
- Jeralt - Father of Byleth, Jeralt was a previous leader of the Knights of Serios before leaving to start his own mercenary band. He later rejoins the Knights of Serios.
- Catherine - A formidable swordswoman, Catherine is a powerful knight in direct service to Rhea. She wields the powerful Thunderbrand.
- Alois - A knight who served under Jeralt when he was leader of the Knights as his self-proclaimed "right-hand man". He is known for telling bad jokes.
- Gilbert - A reserved knight who is difficult to get to know, but is polite to those acquainted with him.
- Shamir - A former mercenary who joined the Knights as a means to repay Rhea for a debt. As a rare quirk, Shamir is not devout to the Church of Seiros, only to Rhea herself.