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Tears, sweat, or blood in Nijiirobanbi art is always a spectrum. "Rainbow tears" (nijiiro no namida) are a specific meme within the aesthetic. The character may be screaming or smiling vacuously, but liquid flowing down their cheeks will cycle through red, orange, yellow, green, blue, indigo, and violet.
However, there is a small chance you could be referring to other things due to the components of the name ("Nijiiro" meaning rainbow and "Banbi/Bambi" being a common term for a fawn): The digital artist Nijiirobanbi An illustrator often active on platforms like nijiirobanbi
Nijiirobanbi has seen lineup changes, but the core archetype remains: Review: Nijiirobanbi Tears, sweat, or blood in Nijiirobanbi