Let's be honest here, I'd be thrilled with 10 more DLC picks because odds are that I wouldn't have a single request left if that were to happen.
At the same time, I don't think it's a good idea to get ahead of ourselves when we haven't even gotten through the first set of DLC characters. I think it's totally possible that we get more than a 2nd season, but to start considering that now is...I think, a bit too far ahead. That, though, is mainly because of how this fanbase gets with never preparing itself for the end, and then getting buried with salt.
The #1 way this fanbase is going to get completely ass-blasted is if we get 10 additional DLC characters and none are 1st party. To assume, suddenly, that all the missing spirits are getting in down the line is, potentially, setting folks up for disappointment.
I mean, hey, I think Astral Chain and Three Houses both have great candidates. But I still get the feeling we're going to get more 3rd party crossovers.