Strategies

Fighting Orb Sages/ Zen Monks: Use ranged weapons like archer, marksman, gunner, etc. Hero is good against Orb Sage and Zen Monk.

Fighting Paladins/Champions/Heroes: Use the same weapon to counter. Spin Knight is good too.

Fighting Ranged: Do not use Paladin or Champion. Best way is to charge in with weapons that cover lots of space.

Fighting low ranged people: use lancer/dragoon

Fighting jumping people: wait till their extra jumps are done, or jump then strike, paladin/champion/hero is a good choice as well

Fighting gunners or snipers: the best case scenario is that you are chasing the gunner/sniper and the person is running away, they can only aim where they face so you can out run them, then hit them

Fighting lancers/dragoons: jump and confuse them, then, attack

Fighting gravity affected ranged classes: unless its grenadier and/or bomber, you never want the high ground

Fighting bouncer: go somewhere open so bouncers have to target you instead of making it bounce at you, dodge and chase them

Fighting any ranged weapon: never use high knock back weapons (lancer, dragoon, paladin), fight with the same