-Naruto/shippuden
-fairy tail
-soul eater
-fruits basket
-bleach
-black cat
-ao no exorcist
-ouran high school host club
-high school of the dead
-kaichu wa maid sama
-the melancholy of haruhi suzumiya
-death note
-vampire knight
-kekkeshi
-k-on
thats all i can think of right now
I think that you should watch "Kill Me Baby!". It's an anime about a high school girl, an assasin, and a ninja (who comes into the plot in episode 2 or 3). Though it's only 8 episodes (If I remember correctly), it's still a wonderful anime.
inu x boku ss that the best anime iv ever seen the anime is not that popular cause befor a week or more it was on going series...here the main character picture: