Despite being playable in Fire Emblem: Three Houses, Gilbert, Anna, Cyril, Hanneman, and Alois all have recruitment flags (the internal value which tells the game if the unit is in your army or not). They lack any skills or data assigned to them however and trying to deploy these units or use them in battle with crash the game.

Interestingly, Gibert is not referred to by his real name nor is he sorted to be with Kingdom characters despite his role in the Three Hopes story. However Alois is always sorted to be next to Jeralt and Byleth in the menu, rather than with the Church like in Three Houses.