- Mousse's unit card can be unlocked as a binder collectible by beating Wanderers Final Episode on Normal difficulty or higher.
- Mousse is based off of a running gag in the OJ series, where frequently refers to as "Mikky Mousse".
- Mousse has no music theme of its own; when leveling up in the Wanderers Campaign, theme ▶️ is played instead.
- Mousse is the only monster with a voice pack.
- Mousse's and DLC to unlock. voice packs are the only voice packs in the game that don't require
- Mousse is the only monster with associated emotes.
- While Mousse is not a playable character, Poppo can obtain the Mousse Poppo Costume, making her look identical to Mousse.
- Mousse counts as a variant of Poppo for the purposes of activating character-specific voice lines.