Mélodie Bloo is a character I created.
She is a personal project.
Mélodie has been exposed to Cobalt dust the day she was born, it was an accident while her father was working in his lab. Cobalt dust turned her hair permanently blue, and her skin too! But growing up the coloring washed off, but now she finds herself again working in a lab, turning blue again.
Her body is immune to the toxicity of the substance.