"Take a group photo with your alts" mode that lets you put all your characters together in one place and pose them one-by-one.

I'm picturing something like a few preset backdrops and poses that you can drop your characters into. The particular one that comes to mind is replicating the Scions group shot for Shadowbringers with them all posed on the crystals. Or maybe the "movie poster" group shots they do for each expansion.