Cinnabar
Cinnabar is best known for being the Gem who's essentially locked into isolation—their body literally produces mercury, which is toxic to basically everyone else. It's a rough situation that's shaped pretty much everything about them. They've got a pretty gloomy outlook on life, which honestly makes sense given the circumstances.
They work the night patrol shift, which is fitting given their personality. It's lonely work, but then again, they're used to being alone.
Hardness: 2
The low hardness rating is one of their more frustrating traits in combat situations. They're fragile compared to most other Gems, which doesn't help matters much.
Content compiled by AnimeList.moe from publicly available sources.
