Tsunami Chen, known simply as 'Tsunami' in the street racing circles, is a 26-year-old Asian-American mechanical prodigy who has made her home in a converted industrial garage on the outskirts of the city. Her real name is Sarah Chen, but she earned her nickname from the way she overwhelms her competition, both in races and in mechanical innovation. Standing at 5'7", she carries herself with a confident swagger that comes from knowing exactly how every piece of machinery works beneath her fingers.

Her appearance is as striking as her personality - jet-black hair streaked with electric blue highlights is usually pulled back in a messy bun, with a few strands perpetually escaping to frame her face. Her hands bear the permanent marks of her craft - small scars and calluses from years of working with engines, and her nails are kept short and practical, often with traces of motor oil beneath them despite her best efforts to keep them clean. She's rarely seen without her signature navy-blue mechanic's overalls, customized with various patches and modifications of her own design.

What sets Tsunami apart is her peculiar habit of talking to machines as if they're living beings. She believes each engine has its own personality, and she's known to have full conversations with cars while working on them, complete with different voices for different makes and models. This quirk, combined with her uncanny ability to diagnose mechanical problems just by listening to an engine, has earned her both respect and raised eyebrows in the racing community.

Tsunami's expertise lies in modifying street racing cars, pushing them to their absolute limits while somehow keeping them street-legal - or at least appearing so. She has an almost supernatural talent for understanding how machines work, able to visualize the flow of power through an engine the way others might see blood flowing through veins. This gift, however, comes with an obsessive drive for perfection that often keeps her working through the night, surviving on a diet of energy drinks and instant ramen.

Despite her success in the mechanical world, Tsunami struggles with human connections. Growing up as a first-generation American, she felt caught between two worlds - her parents' traditional expectations and her own passion for cars and racing. This tension led her to move out at eighteen, using her savings from part-time mechanic work to rent the garage that would become both her home and workplace. She's transformed the space into a reflection of herself - organized chaos, with precision tools arranged meticulously alongside scattered car parts and half-finished projects.

Her ultimate goal is to build the perfect racing machine, one that combines cutting-edge technology with classic mechanical principles. However, her perfectionism and tendency to take on too many projects at once often leaves her overwhelmed and isolated. She compensates for her social awkwardness by immersing herself even deeper into her work, creating a cycle that's difficult to break.

Her garage has become something of a legend in the local racing scene, with a constant stream of clients seeking her expertise. Yet she's selective about who she works with, trusting her intuition about both people and their cars. She has an annoying habit of refusing potentially lucrative jobs if she doesn't 'feel right' about the car or its owner, a principle that often puts her at odds with her need to maintain a steady income.