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Lately this has been bumped into my head for years, and I keep to make sure that this isn't a fever dream anymore. Also brought into a discussion in a discord server one time.
It's a gritty animation show made in South Korea. No blood or sexual things were shown, but it's has few death scenes. Kinda dark, and maybe older kids watch this. I was about 7-ish at that time.
Here's a synopsis: The story follows a red-haired boy, a yellow-haired girl, and the one I remember the most: a blue-haired young man with glasses. Together, they use a watch-like transformation trinket and became a heroic power trio to fight crime and all that.
Also there's a mobile game based of this? Can't remember.