How to Create a Good Persona
For most part of the game fusing the highest level persona available is enough tbh. I usually try to have most of the elements at my disposal on 1 or 2 personas to attack weaknesses, preferably with no elemental weaknesses and a persona for healing, enhancing and weakening.
It’s good to have specific passive skills like dodge fire repel ice, elec boost etc. A massive game changer can be skills like invigorate which restore sp every turn and victory cry which fully heal hp and sp at the end of every battle.
Most of the time you won’t get the skills you want on the persona you want. You’ll have to fuse them into each other which can be tricky but definitely doable.
Fuse as many personas as possible and check out their skills you’ll find ones that you like. Make sure the social links are high as every person’s best moves are usually at its highest level.
Hope this helps a little!