Alright where here's my suggesstions.
Yozakura Quartet: I bought the first two volumes on impulse today and I really like it. It's about a girl with superpowers, a kotodama, a demon and the guy that hangs around with them. It's hard to get into at first but from what I've read it's quite good.
First chapter of it was the only one I could find so here it is for a demo: http://www.mangafox.com/page/manga/s...ura_shijuusou/
Persona 3: Persona 3 & 4 both have manga adaptations but 3 is the one with the most xhapters. Both are done by the same mangaka at the same time and are both very well done. 3 in particular fleshes out some of the characters more (if that is possible), gives a fair amount of background on Mitsuru's childhood and has a lot of funny moments as well. The only complaint could be that the story is not told in order but instead jumps around a lot but it doesn't detract from the manga's greatness.
Persona 3: http://www.mangafox.com/page/manga/s...124/persona_3/
.hack//G.U.+ : Basically a retelling of the story of .hack//G.U. this manga has some great character designs. The story is drastically different than G.U. in some areas but the stroyline is good enough to stand on its own. Highly recommended for .hack// fans but people new to the series may want to check it out too.
.hack//G.U.+ : http://www.mangafox.com/page/manga/s...1379/hack_g_u/