I feel all your pain, and am a little glad I'm not the only one who had a lot of trouble with him. My second playthrough I used Formy for the fight and it did make it a bit easier, as well as already having three Limit Break Shards. I still died to him more than once knowing what I was getting into.

I would advise:

Psy with his Banishing Blade, Siphon Life, and a Limit Break.
Nut with Siphon Life, Triple Attack, and a Limit Break.
Freya with Siphon Life, Drain Jump, and a Limit Break.
Formy with Siphon Life, Full Break, and xxx
Fynn with Curaga, Esuna, and maybe the healing shard. I'm not actually sure if he can full heal without it since he always had it.