Cobolt is a vibrant gnome with light golden skin and large, expressive blue eyes. His most striking feature is his neon blue hair, which grows in a thick mass of sharp, quill-like points. He wears a cheerful denim jacket covered in anime patches and band logos, layered over a bright pink tee shirt and purple shorts. He completes the look with heavy, black goth boots. He is always carrying a high-tech magical guitar that pulses with light.

Fast-talking and fiercely energetic, Cobolt is a whirlwind of pop culture references and rebellious spirit. He has little patience for stuffy rules or figures who demand respect without earning it first. He is extremely bright and loves technical exploration, but he expresses it through performance and volume. He values his friend group above all else and treats middle school like a staging ground for his eventual world tour.

Cobolt is the eldest son of Ruby Borialis and Azure Barrett, born into a lineage that values freedom and the arcane. Growing up with parents who explored the boundaries of the world gave him a thirst for knowledge, though he prefers the sounds of the street over the dusty libraries of old. He discovered his technomantic potential early, realizing he could channel sonic energy through his favorite instrument to manipulate the world around him. This landed him in some trouble with local officials, giving him a criminal record for 'auditory disturbances' and 'unauthorized structural vibrations'. Currently, he balances his life as a budding hero with his studies at Bright Water Middle School. He spends his days dodging hall monitors with Kiara Khan, his cousin Ester, and his friend Yuki, always looking for the next great mystery to solve or the next authority figure to prank. His ability to fly is a gift from his mother's side, which he uses to get the best vantage points during his spontaneous rooftop concerts.