Fantastic game. Can someone give me a quick beginners guide to the demon fusion? What am I looking for? Should I fuse at every opportunity or does it make sense to level the demons before I fuse them? Do I want the standard rpg set of healer, element 1, 2, 3 etc? Thanks!
I'll start with the last question, as that inpacts the other responses:
Yes, you more or less want a somewhat standard set. It's good though to have each demon have a secondary job/element, which is possible as you have 8 skillslots. Don't forget the buffer job though.
So, what are you looking for? First and foremost, you have to keep in check the affinities of your demon roster (e.g. never ever have a whole party weak to Light or phys). This is because of the press turn system, which will destroy you if you don't keep that in check, and help you a lot if you do.
With the same idea, you'll always want to have every element spells available in your party. Ideally, your spell caster should have at least two or three different elements available (it's easy to get with the new fusion system).
All demons in the game are in one of three categories: MP type, HP type, balanced type. The latter one is the standard values for HP and MP (something like double HP vs MP I think). The MP type have more MP but less HP (they get roughly equal), the HP type have more HP but less MP. Depending on the job you want to give the demon, you have to choose the correct type. Note that the MP types are
very frail, so you should either have to get them HP-boosting passive skills, or switch to a blanced type for your casters.
Aside from that, you have to keep in check the skill the demon has innately, and what the fusion fodders will give them.
Edit: and of wourse the stats of the demon. No need to make a balanced type demon with low Mag a magic caster.
And lastly, when tu fuse? Pretty easy: when you get the feely your demon is getting weak, or if fusing it will get you a new powerfull skill or strong demon.
Edit: and if a demon has a skill you want to get on your MC, or you already have but not maxed out, definitevely wait for the demon to learn all his skills before fusing him, to get him to whisper the skill to your MC.