Wakka is OP for grinding levels.
Using the stage 57 method for grinding levels, which essentially means unlimited AP through a long, long time.
Lux is generated per hit, which means large bunches of enemies x multi-hit AOE x low damage = LOTS OF XP.
Meaning this guy:
plus this stage:
is an easy 1000+ XP per 3 stam (6 stam after April ends)
- Wakka MUST be 6*, MUST be lv1 and have NO Special Attack upgrades. The first makes his special attack do 8-hit AOE, and the latter two are to keep his damage down.
- Since Wakka is red he does even less damage to the AOE mobs in stage 57.
- Adding a second Wakka would probably make the earnings go up to ~1500/run
- Put some random high level green guy in the 3rd slot to finish off the boss. If you don't kill stuff in 1 turn you get far less Lux. (I'm using 6* Wakka, Less-baller-Wakka, Stitch on Olympia so I don't need to keep swapping medals around. Not using Olympia for anything else right now)
Additionally, while that's cool as a baseline, the actual cool level grinding is that:
- As far as we can tell, Raid Bosses spawn after a certain number of kills, the type determined by what stage crosses the threshold.
- Running stage 57 3 times after a raid boss guarantees a Guard Armor will spawn
- Running stage 57 2 times, and then virtually any other stage almost guarantees that stage's raid boss will spawn
- Raid boss gives an insane amount of XP.
Also, remember that like all gacha/stamina games, even though Unchained is far more lenient with its rates, AP refills are a finite resource. Some time into distant future at really high player levels this method may be too cumbersome to continue using. Therefore maximize AP usage, and try to level up with AP as close to zero as possible, after burning it on whatever you need (Dailies, etc). But of course, if you've played gacha/stamina games before, you already knew this.
tl;dr, if you manage to get a Wakka to drop during your Unchained escapades, you should prep him to eventually become a 6* lv1 with no Special Attack upgrades. Once you have that in place you're set for grinding levels after you're done with story content.
edit: Wakka can apparently be substituted with KH1 Riku for slightly less great results.