Hunter: Hand cannon and sniper. Their whole gig is about precision damage, marksmanship, and heavy hitting big caliber weapons. Voids gig is invisibility, solar is throwing knives, and arc is about melee. Swords are a good addition too because they can be fast and hard hitting, like quickfang. Scout rifles, shotguns, and sidearms can be used in certain situations but hand cannon and sniper rifle is your bread and butter for those headshots. Next is warlock, I'd pair a Scout rifle along with a pulse rifle, good range for a middle ground fighter, which is where you should be for something as squishy as a warlock. Weapons like sidearms, smgs, and of course swords also work. The warlock is good, but they have low mobility but high regeneration, so it's best not to be too close or too far. Finally we have titan. Auto rifles and shotguns are going to be your best friend medium to close range. Being able to reliably hit targets with a bit of distance but wreck havoc in close quarters. Complimentary weapons are smgs, hand cannons, machine guns, swords, and rocket launchers. However for all 3 of these I advise running sword, since it's amazing for cutting down enemies quickly.

Any rapid fire fusion and a scout, scout for long range fusion for stopping shotguns