A member of the Monika Guard first appeared in Cuphead 3: Please Don't Sue Us Edition, although it was not stated as such. It was also planned for a Monika to appear in Cuphead 3: Game of the Year Edition, though she was never added. The group was first named in BA Legends: Dr Gucci.
Cuphead 3: Please Don't Sue Us Edition Edit
BA Legends: Dr Gucci Edit
The group makes their first and only named appearance in BA Legends: Dr Gucci. They invade Dr Gucci's realm to take it over for Monika Sans, and when he refuses, they summon Monika Sans herself.
The theme of Monika in the only game she has a theme is Your Reality. It can be said that this is the theme of all Monikas, and the Monika Guard.