Jatayu is level 61, so you'll have to wait just a little while ;) Trumpeter is indeed a pain, but you'll need him to complete margaret's requests. Also, at level 71, he learns the best spell to use against the final boss of the game, Debilitate ;) So he's worth it, in my opinion.
The best persona to me was indeed Helel. He can learn Megadioalon and Divine Justice, both do Massive Almighty Damage, plus, you can Fuse inherance all the 4-dyne elemental spells, debilitate and almost all physical attacks, plus he has tons of resistances and even null damage.
Here's my notepad recipe for the Ultimate Helel, in my opinion.
Moon Girimehkala (Lv56: Repel Physical) x Hermit Nebiros x Tower Masakado > Judgement Michael (Reflect Physical)
Use the above Michael to make Judgement Lucifer. Level up so that it has learned Mind Charge, Spell Master, and Victory Cry.
Judgement Lucifer x Hermit Arahabaki > Star Helel (Repel Physical, Mind Charge, Spell Master, and Victory Cry)
Bear in mind that to fuse Helel, you'll need to be at level 87, which you'll easily reach in the final dungeon. The biggest drawback of my strategy is that Lucifer requires you to be at level 93, you can just fuse a Magician Mada and Moon Baal Zebul to get a basic Helel.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"







