Character themes named after fashion brands and luxury goods, scoring an underground world that's more glamorous than you'd expect. "Theme of Givenchy," "Theme of Galiano," "Theme of Trefle," "Theme of Diamante," and the naming convention gives every character an air of elegance.
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The area themes (Underground City, Underground Ocean, Underground Forest, Underground Mountain) each get two versions, creating a sense of deeper exploration. "Theme of Hala & Die" pairs two characters. "Theme of Rapier" cuts sharp.
The progression through subterranean biomes gives the soundtrack a clear geographic arc from city depths to mountain heights. If you like RPGs where every character sounds like they walked off a runway, Momoiro Underground's naming sense alone is worth exploring.