My first introduction to the game was through my cousin, and making a character here and there on his account when I had the opportunity. While I had my own account, I was too young to pay for it, so I eventually just ended up using my cousins.
My first ever character on my account was a Tauren Druid name Tigerjaw, which I still have to this day. He's still chilling on Caelestrasz around level 25, wearing his Competitor's Tabard from back when the Olympics were running. I've since decided to leave him be, as a sort of nostalgia for the old days of WoW.
Back on my cousin's account, I continued to play on the server where he kept all his characters. I stayed as a druid, but this time I was running as a Night Elf Balance Druid called Khazran. Levelling in Classic / BC content was tough, really tough. I was sooooo slow, and died so often. By the time I hit 55, Wrath of the Lich King had been out for months, with my cousin patiently waiting for me to enable Death Knights on his account (I was far ahead of him).
In the interim, I hopped between a couple of different guilds, even faction changing my Hunter to Horde to play with a buddy. But by the time WoD had released, I was alone in another empty guild. I decided to faction change back so I could interact with my alts again.
I begin my break through all of MoP.
I return from my break for WoD, still hanging around in an empty guild while I did my own thing.