Sprayers
"Aim, you idiot!" "I can't, I'm black!"
Sprayers just are what they are. They seem to lack the ability to keep their cross-hairs on the target, so to compensate for this, they use 'spray-and-pray' tactics with high-capacity, high-powered, and/or fast-firing weapons. Sprayers make great distractions and are dangerous in swarms, but alone they are nothing; that is, if you don't embarrassingly forget up.
Tanks
"MOVE BITCH, GET OUT THE WAY"
Tanks are the ones who use the supportive weapons in offense; they basically treat an LMG as if it were just an SMG with bigger rounds, or a rocket launcher as a frag grenade with a bigger boom. They tear down anything in their way, are usually the first ones in to the fray, and forget about their flanks often. Tanks are great at intimidating and base storming.
Flankers
"HAHAHA, 'Watch those corners corporal,' BOOM TOOLATE AHAHA"
Flankers are those annoying guys that you should've saw earlier. They stray away from the rest of their team to provide support from a different angle, and are effective at any range. They prefer mobile weapons and like to set traps. Flankers are usually good all-rounded soldiers, just as long as they have corners to hide behind or long distances to remain unnoticed.
Campers
"I just pissed in my pants lol"
Campers are basically living traps; they wait in one area for a chance to surprise someone and quickly kill them without giving them a chance to fight back. They like to use one-hitters like snipers and shotguns, and usually like to carry a good spraying weapon to make up for their primary's slow firing rate. Campers are great supporters and defenders.
Rangers
"ALL SPRAYERS MUST DIE"
Rangers are like the quickscopers of the team. A sprayer's worst nightmare, able to engage enemies at any range effectively and efficiently. They may or may not follow the rest of their squad depending on the situation, make excellent counter-snipers, and are overall great guerrillas. Rangers like anything with accuracy and power.
Marios
"I'm better than you in every way >:C"
Marios are the all-rounders. They of switching between different roles to adapt to situations and environments. They are team players and usually like to have a wingman to help them out, and could be considered the backbone of any team. Marios, being all-rounders, prefer all-rounded weapons that don't particularly specialize in any single role.
Loners
"QUIT FOLLOWIN ME YOU'RE BLOWING MY COVER"
Loners are like ninjas. They use stealthy tactics and quick moving to gain the upper hand. For some reason sprayers tend to follow loners and screw everything up for them. They branch off of the team to go take out enemies all stealth-like; they're great for flanking flankers and counter-sniping. Loners prefer close-range, suppressed, versatile weapons.
Pros
"Boom, 1080 no-scope headshot"
Pros are the tricksters. They just take everything head-on and are great at multi-tasking. They don't usually stay with the rest of the team unless they think they can take advantage of them somehow. They make great distractions and show-stoppers. Pros prefer anything badass or powerful.
bam done