Depending on the game, im either a crazy ass CQC (Close Quarters Combat)/suicidal/distraction guy, mainly because its the most fun, and you either kill everything that moves or die a
(un)glorious/hilarious death whil causing the most amount of chaos you can lol
Bu also I do like being a support guy, for instance being an aggressive Engineer in TF2, or creating defencsive line that teammates can fall back to, thats pretty fun
In games with vehicles though, im a friggin beast at vehicular combat, i just have a huge knack for it, and i really do love it, particularly in the battlefield series
I also can play a mean sniper, but thats the least fun to me and the least satisfying, so usually i use snipers in ways they arent supposed to be used lol