Start with the first 6 characters you get and place them in front or back so their buffs or de buffs are active. Some characters attack more due to their speed so equip weapons with best attacks on those. Once you beat Labyrinth 8 level 101, you unlock unknown village to the east. You will probably need 20+ MhpUp++ which gives each character an additional 75% hp and completely heals them so don't use until they're low on health for maximum effect unless they get killed. Max party of 6 ensures survival.
You will need to spend diamonds to get 20+ stacks but you will be able to farm them later. You don't need to unlock extra slots just the one already there.
At unknown village buy as much weapons at weapon shop 6 because you will need the rng to give you a good drop. You just need one or two weapons with gems that increases exp, money and diamonds. One is more efficient. Equip said weapons on characters that attack the least and or survive the most. At this point, pick any characters you like. Buff the weapons you got at weapon shop 6 that has exp, money and diamonds gems at Chenapori crystal shop 4 for only 1 diamond each time with half the diamonds you have left. You may need to watch ads and use time cheat. I would suggest having a few hundred diamonds. Now with the rest of your diamonds go and buff the weapons at Varuno crystal shop 3. Each diamond you spend here will exponentially increase the exp, money and diamond buffs. You rest you should be able to figure out
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wakeceo
crazyninja88
Catman 63