My first RP experience was playing MERP (scaled-down RoleMaster for those unfamiliar) with a smattering of characters in one-off adventures. My first long-term character, though, was an evil wizard. Took him from level 1 up to 18 back in 2nd edition. There were a couple breaks (once in low levels we switched to play a Dark Sun campaign for a while, I recall), but we kept coming back to it. After a while I split from the mostly-good party and set up shop in a kingdom of my own, picked up a lizardman lieutenant. I got conned into putting on a helm of opposite alignment (long story) and ran around as an emissary of Bahamut for some time. In a side campaign, in one of our breaks from the main campaign, the lizardman went on a quest to find a ring of wishes to restore me to my rightful evil-wizardy glory. Restored, with Tiamat now in my corner, and mighty pissed at the former party member who'd tricked me, I drew him into a climactic battle which ended in mutual death via suicidal staff of power usage.