My first manga I read is Ranma 1/2 by Rumiko Takahashi, I bought comics when I was a fifth grader and I love the plot, characters, the humor, romance, I really in love with Rumiko-sensei's manga style! Neat artlines, bold and always speaks from within the heart and soul.
I'll go first;
*Ahem* My first anime was 'Durarara!!!'. I don't count Dragon Ball Z, Yu-gi-oh, or Pokemon, mainly because I didn't really know it was an anime until later on. My brother actually introduced me to these so I'm really glad he did. Sure we bicker (a lot), he can be one hell of an anime geek. But yeah, I REALLY enjoyed 'Durarara!!!'.
My first manga was probably Ouran High School Host Club or Black Butler. But either way, they were outstanding mangas and were really funny at some points, and pretty cool too!
Your turn guys!