sorry for the delay. I suppose you mean to ask if a party member can be added mid battle? This can be done, you just need to remember that during battle we use temporary party units that copy from your external data (this is just to maximize compatibility with different data systems). You can simply create a new party unit as needed for your new party member and them to the partyUnits list like the others (and refresh the turn order!). As for permanence, you just need to remember at the end of battle to add the relevant information back to your global struct (if using my example data system). Given I don't know how every game will want to track its data I don't cover this, but given it might be a popular request I might just cover this on the assumption you're working with a global struct like my example. But it will come much later/at the end of the series.