They are supposedly an "elite" group of guards, but many of their members appear laughably incompetent. Undyne, the leader of the Royal Guard, decides who becomes a member. Papyrus's dream is to become a famous member of the Royal Guard, but despite his surprisingly adept combat ability, Undyne secretly does not let him join as he is too kind and friendly, believing these attributes may get him killed in battle.
- The members of the Royal Guard playing poker at Grillby's was inspired by a painting titled Dogs Playing Poker.
- The canine members of the Royal Guard located in Snowdin are called the "Snowdin Canine Unit" by Undyne before her battle.
- There are two unused members of the Royal Guard, RG 03 and RG 04.