I didn’t even progress a single game day in Persona 3 tonight, as I spent it all working on personas instead. I combined up a whole bunch of ones I was still missing and now have 85% of the compendium filled. The remaining ones are mostly ones that are difficult to get because they either require a maxed social link, they’re beyond my level, or their combinations are a bit weird and you have to start at the top-level ones in their arcana and work downwards.
After that, I put together a handful of personas specifically for farming heart items from them. This is how I’ll get the immunity items I need to take on the Reaper comfortably, using Surt for the fire immunity, Gabriel for the frost immunity, Jatayu for wind, and Thor for electricity. All you have to do is fuse them however many times you need until you get a notification that they have a heart item, level them up until just before the point you get the item, and register them in the compendium. Then you can cycle through leveling them up to get the item, ditching that one, and buying the old one from the compendium to level it up and get the item again. Having Growth 3 on them helps a lot since then you don’t have to use them specifically in combat.
I now have everyone’s elemental weaknesses covered with immunities except Akihiko; Gabriel is taking longer to level up since I failed to get a Growth skill on it and the associated social link is fairly low. It’s only a couple levels away now though, so it won’t be too long.