Hmm...I started with Noel because I Drive-spammed a victory my first time Blazblue at the arcade. After it came out for consoles, I played Noel for a long time, almost immediately disliking drive in favor of trying to do lots of things with Silencer. After my girlfriend started playing and picked up Nu, I subbed and eventually mained Hakumen.
When BB:CS came out, I picked up Hazama for a while and then played Tsubaki as a joke. Eventually I realized something: Even though Rachel is bottom tier, she still gets a lot of love. Tsubaki doesn't at all, poor girl. So, I decided to main Tsubaki because no one else wanted to and fight some nice uphill battles. It's way more fun than being on top in my opinion, battles get intense and with Tsubaki's piss-poor damage output, drive and moves, every little jB hit counts .