Let's see...
WoW - Druid/Hunter
SWtOR - Bounty Hunter
D&D - Always Rogue
Darkest Dungeon - The guys reserved for me are Bounty Hunter/Graverobber. For those that don't know, they're focused on positioning and stuns.
DA:O - Mostly Mage
And in everything else I tend to favor range (weapons or magic) and stealth.
I guess the one thing they have in common is versatility. Whether it's through pets, CC, positioning or just a varied kit, I like having the tools to be able to handle any situation thrown at me.