Born in Brighton, to an Irish mum and English father. Her father was a salesman, so they moved around a lot, following his next big job.
Rhiannon moved to America with her family at the age of 14. This wasn't a change she wanted, and the constant upheaval and moving made it impossible for her to form connections to people. This ended up with Rhiannon falling in love with car culture and racing from the early Fast N Furious movies. If there was one thing she could find to relate to wherever they moved, it was cars. Everywhere had fast cars, and people willing to show off those fast cars. Her parents tried their best to keep their only child from this pastime, but Rhiannon wouldn't listen.
When she turned 18, she drifted around America, following whatever racing scene she could find. It didn't bother Rhiannon if it was legal or not, though she often had to spend time working, trying to earn the participation fees. She was decent enough to make some money doing it, but her cars had a…habit of colliding with inanimate objects. As a result, her winnings only just offset whatever repairs she'd need done, sometimes a whole new car altogether. If she was really lucky, she'd win a car from her racing efforts, every now and then, she'd have to borrow a car from others to compete.
At one event, in Detroit, Rhiannon managed to win a stacked race when the leader broke their transmission on a rough pothole. The prize for that race was a custom 2009 Corvette ZR1. Unfortunately for Rhiannon, she never got to drive the car, it was meant to be a way to pass drug money between gangs, and they convinced her to hand it over before things got ugly for her. Now without anything to her name but a charity donation for her cooperation, she decided to take up an off from a contact of hers. She moved to Los Santos, where she met Alex Quinn, who was nice enough to show her around, buy her a car and even get her a job at The Bean Machine.
Rhiannon stayed in contact with Alex, meeting up with her when their busy lives allowed for it. Over time, they got closer and closer, culminating in what they now call their first date. Alex had taken Rhiannon out to drive her Dukes, modded after Dom’s Charger from Fast and Furious, when Alex tripped the alarm of a nearby car without telling Rhiannon. When the cops showed up, she told Rhiannon to floor it. Jokingly, they refer to their first date night being spent in prison. Recently, they made it official, with Rhiannon knowing that every scratch her cars suffered would be met with a frown from her mechanic girlfriend.