Thread:MMYP999/@comment-27109830-20180523194209/@comment-27416494-20180716182352

I just took the names of the protagonists of Persona 3 (including the FeMC from Portable), 4, and 5 and arranged them into a RWBY styled team. This was before Persona 5 came out, so I was calling Joker Phantom back then. The 9s are just meant to signify the damage cap in most RPGs.

There's that, and I'm pretty sure a lot of the other usernames I wanted to try at the time were already taken.