Several to be honest, and I feel horrible about it.
Naruto: Mainly because I forget, and just because it feels like the story is kinda running a bit to long.
Bleach: Too. Damn. LONG! I've tried several times to watch it. I just can't! It's too freaking long! It feels like after I finish watching 100 episodes, they add another freaking 100! That's probably an exaggeration, but, it feels that way sometimes.
D. Gray-man: Felt like it was just filler after filler after filler to be honest. I stopped I think after episode 53 or 54. I'm not sure. It just got too boring.
i started reading the kingdom hearts manga and i dropped that one about 1/4 of the way
then there was the tyrant who falls in love..........i finished the manga but never got to finish watching the OVAs
and there is bleach and i was thinking about finishing the anime ( i got to episode 104) but it kinda dropped my interest
i also started watching inuyasha but i only got to the 4th episode and there was d. grey man and i really wanto to watch it but im really feeling the story (well i only got to episode 5 whee ) and theres fullmetal alchemist,i really tried to watch it but i ended up dropping it and going to FMAB
and then there sekaiichi hatsukoi i really like the whole story but i ended up not having time to watch it/read it and i dropped the manga about 3/4 of the way and i only finished the first season in the anime
and then theres k-on ...............i tried to finish reading the manga but it was too long for me and i attempted to watch them anime but i couldnt find it anywhere on the internet ( i really didnt try)