>>715573284 (OP)warrior and black mage are mandatory, warrior to tank all the random battles and black mage to nuke/status the more annoying ones fighter can't facetank and you can't easily escape like those piece of shit ghouls that stun your whole party
you want at least one healing guy so either rdm/whm. rdm is better if you're playing NES for some reason but otherwise is a bit of a meme. most of your healing past a certain point will be chugging healing items/tents/the heal staff though
then either thief or monk, ninja gives you a guy that can cast some really sweet buffs on warrior while your other casters are doing something else (or just get them online faster) while using all the hand-me-down warrior gear and is harder to kill while monk just exists to punch people really hard and take lots of damage if he ever gets hit, he also saves you money so you can gear up your other characters faster because after like level 10 you literally remove all his gear and mash the attack button the whole game
TLDR: the meta is 3 warriors and a red mage but that's some corny shit