I normally make healer classes with a lot of high physical damage traits.Kinda like my avi or this http://steamcommunity.com/id/derpu/screenshot/470861247205497291/?tab=public
If I can get my hands on a pike/halberd in any video game, I'll abuse it to death. Spear+Axe is totally worth it. A class, however, would depend on the RPG. I'm normally the destructive wizard or the "kung-fu guy." In Disgaea, I put my pledge on a Succubus; Fallout has a good amount of snipers I like using at times.
Yea you are right. Some games offer completely different classes than others like "Martial Artist" or "Merchant" whereas some offer the classics: Mage, Warrior and Ranger.