Have you tried Fallout/ Fallout 2?

Try Grand Chase
It's not 2d
It's more like 2.5d?
Anyway, when you first start off you get 3 characters
A mage, archer and a warrior
As you progress through the game you unlock characters
Hard to get them by yourself
But then again you can just find some nice guys that are like level 50

I stopped playing cause my computer died then when I got my new computer I completely forgot about till now

i dk if anyone have write this but, you can try maplestory. its a 2D manga rpg and i think your computer is good enough(i dk anything about that with the computer)

^ he has that on the first post...
but MS is a good game, bit large of a download now (used to play it when it was 600MB)

Okay, I'll check 'em out.
Thanks.