I am trying to start a new party with the characters I hadn't used yet, but it's telling me I need to delete characters first. I can't do that because my other party is waiting for new content to be released.

This is an unnatural and unnecessary restriction, it's not documented anywhere and it's not fun, please remove it as soon as possible, otherwise I can't keep playing inbetween content updates.

There is upper limit on how Many characters you can have. 24? at this moment I think. Look how many experienced characters you have and delete those that you don't need.

I'm worried though, how do I know which ones are safe to delete (ie, not currently in a party)

You have to go to story mode and select the croup.

Then go to character screen and press three dots button (look the picture below)

https://www.dropbox.com/s/ughvy6o3hs796er/Photo%2011.9.2016%209.07.27.png?dl=0

 

Then give each members a nick Name

https://www.dropbox.com/s/7bzjvq5412xldd4/Photo%2011.9.2016%209.07.35.png?dl=0

(In picture, I have my B-team, so I did put B after each teammember Name, so it easy to know what teamthey belong to)

 

Do the same to each your team. Then delete all the character that does not belong to any of your teams.

(For me it means, that I can delete all characters not in my team A, team B, or in team C.)

Edited September 11, 20169 yr by Hannibal_PJV

As Hannibal said. If you have doubt about a character you have the option 'deck' in the party management (same menu where you see 'nick' option), and you can check quickly what cards that char is carrying on.

Some characters (I'm looking at you Sajan!) just don't want to party..he's all meditation and spiritualism, no time to party.