yehhey311 said:
Lastly, what should my approach be towards persona fusing? So far, I've just been seeing what goes together in a new persona that keeps most of the desired powers from the original personas while adding a few new ones and a higher level. It seems like people are more meticulous about this, but I don't know what the overall strategy is other than "oh that one seems good...i think."
Just experimenting by fusing what you've got every now and then and seeing what comes out is more than good enough to finish the game comfortably.
That said, if you want to do stuff like Margaret's requests (without just looking up recipes in a FAQ somewhere), or fuse together some particular broken endgame personas, you'll need a deeper understanding of how it works. Fortunately, the system that underlies the fusion mechanics is fairly straightforward, so if you do want to get more in-depth in it, it's not too mindblowing.
Basically, each combination of arcanas always produces the same arcana as an end result (there's a big table in the manual listing what the combos are), and the exact persona you get out as the end result is based on the base level of the two personas you're fusing (to be precise, it'll be the next persona up, base-level wise, from the average of the base levels of the two personas you're fusing, and of the arcana specified by that combination in the fusion table).
Three way fusion is similar, but a little more complex - firstly, it does a regular two-way fusion between the two lowest-level personas, then fuses the result of that with the higher level persona, using a slightly different table, but otherwise the same mechanics. 4-way+ fusions are all fixed recipes, so just look at what you need for those as you unlock them.
Skill inheritance is
mostly just random, with the caveat that all personas have affinities for particular types of skills, so they're more likely to inherit those if they're available (Black Frost, for instance, has a Dark affinity, so he'll pick up Mudo skills more commonly than others). Mostly, this just means that if you really want to transfer a particular skill set onto a fusion result, you're going to reselect your fusion ingredients repeatedly until you get lucky (protip for 3-ways - you just need to select the last two personas, not all three).
Now, you can do all of that by poring over the fusion tables and persona lists, and working out levels yourself, but a far easier option is
this utility here, which lets you search for personas by just about any criteria you can imagine (name/level/arcana/skills/etc), then do a reverse fusion search to find out what combinations you can use to create them.
It'll also tell you all the skills a persona can learn via levelling up (as well as much more detail about the skills than you get in-game), and has a standard fusion calculator, so you can experiment with fusions without having to pull everything out of your compendium (i never found that particularly useful, though, given the persona search and reverse fusion calculator).