Mine's been Alternan Rebel since day 1 (well, more like day 5)
It's a subtle nod to playing through the single-player mode entirely upgradeless, including After Alterna. I wasn't the first to do it that way but I'm definitely still proud of it. And I'm also too lazy to change my tag now lol
Some fun title combinations that the game has given to me:
Spawning Grounds Taste Tester
The Forehead
Next Year's Writer (as someone who has procrastinated on writing for the past year)