Ametrine

Ametrine is the first/1st boss fight in Notes of Rhythm. They are the enemy to Oana and they are very rude.

Ametrine isn't the only rude one, they are allies with Lemonade due to both of their rude actions.

Ametrine was never un-corrupted, due to them just being a regular circle before they were corrupted (alive).

Allies
Ametrines allies are the ones that have a similar personality. Like Lemonade and Sprinkle Star. They are the Corrupted Gems group and together it gets harsh.

Enemies
Ametrine only has one enemy by the name of Oana. They really don't like each other, this is seen in the Fighting Scene.