My favorite manga is Loveless hands down. It's way too difficult for me to try to explain it but it's amazing!! Well I will say that it's not for everyone. It has pervy moments and a bit of chomo-ism (a collage student being in love with a 6th grader). It's not your normal manga that's for sure! It's also a shojo (more girly) but my boyfriend reads and likes it too. It also supports gay ALOT!! You have been warned!!!!
If you would like to look at my profile I have listed all the manga I like in order of how much I like them!!