I didn't have a first I watched lots when I was little (even though i didn't get most of it I watched it cuz its awesome) I watched Dragonball series, Slam Dunk, Yu Yu Hakusho (Pic), Rurouni Kenshin, Baki The Grappler, Fushigi Yuugi, Initial D...... That's all I can remember so far.
i dunno i think i watched lots but didnt really know it was an anime...since i was still young i dont really know what an anime is and just thought what i was watching were cartoons (they were Tagalog dubbed)...but when i grew up....was watching TV with cousins then she changed the CH to Animax...i found out that what i was watching before were mostly anime (Mirmo de Pon and other ones i cant remember the names) and then one night we were watching random stuff on animax (bored..cant sleep) we came across K-on! (s2 dubbed better than the ones i heard on you tube for some reason) when i saw the ed "No Thank You" i was awed,watched it,rewatch w/s1,and overall we all Loved it!!! XD
The first anime I ever watched would probably be gurren lagann (picture). It's been like a bit over a year since I got hooked on anime and I don't have the best memory so I don't remember which anime was my first.
Btw I noticed that some people said that naruto was their first. That probably would have been my first if my friends weren't so against it. I still have to pretend that I hate it even though I think that it tis awesome.