First, I joined April 2007, but did not contribute anything until July 2007. The very first article I contributed to was Megaman Zero 4. I contributed because I had the game and thought "hmm, time to make use of this account, I'll see what I can do". Unfortunately, it was already in GA status. Next was Sword of Mana, the GBA remake of Final Fantasy Adventure. I couldn't do anything, not even the story which I knew so much of.
Then the Kingdom Hearts series. All articles there were already FA. Then an artcle caught my eye, Megaman Battle Network!. I also had the game/s, so I contributed a lot to it. I am also an avid Megaman player, so anything I know of Megaman, as long as I can ref it, I contribute.