About 3 hours to go?
I was still thinking about jane and I came up with some arguments for why she could be an echo fighter.
I know a lot of people are going to treat her as deconfirmed and that makes sense but im not gonna give up on her til this month is over.
She makes sense as an echo fighter because she may have a different 'alignment' than joker. With alph and the koopalings they're all in the same boat as the character they're with, but if jane isnt even the same kind of ally, and has a different persona, then she makes sense as an echo fighter. She could have some ability that's different too and could replace one of the b moves.
The other thing is that the data was from an early enough version, so back then they could've been toying with the idea of having her as a costume but decided it wasnt the best fit, the string they ffound can be deleted data they overlooked, and if you think about how the mementos stage was mispelled, it could be as simple as that it's that kind of data.
If we think that nintendo wanted to release joker when they could, maybe this is a case where they'd wait for the extra news from atlus to reveal her as an echo. Not to mention that other 3rd party character like the belmonts and street fighter got echos in this cycle, it's not impossible for sakurai to like that trend and make one for dlc either.
I know I'm stretching a little and she can easily just not show up at all, but I do want to put the idea out there and keep a little open about it at least