Best non-mainstream mangaka

[Aoshika]

Fuyumi Souryo (Eternal Sabbath)
Naoki Urasawa (Monster)

I like realistic art in manga

[fxu]

1. Furuya Minoru (Boku to Issho, Ciguatera)
2. Iwashiro Toshiaki (Psyren)
3. Kondou Kazuma (Deadman Wonderland)
4. Azuma Kiyohiko (Yotsuba&!)
5. ??????

[Kikiz]

1. Harold Sakuishi (Beck)
2. Naoki Urasawa (Monster, 20th century boys......)
3. Gosho Aoyama (Detective Conan)
4. Kano Yasuhiro (Mx0)
5. Ito Junji (Horror mangas...)

Tough choice... I had to randomly pick #4 and 5... So many good mangakas~~~

[Noir]

1. Majin Tantei Nougami Neuro (Matsuei Yuusei)

Probably the only one, though other manga I read are in the middle of popular and non existant they're spoken of alot on this site so I don't think it counts. (Ex. D. Gray-man, Reborn, Soul Eater, etc)

[Nagatobimaru]

1) Kazuhiro Fujita (Ushio to Tora)
2) Michiaki Watanabe (Hamelin no Violin Hiki)
3) Akira Matsumoto (Galaxy Express 999, Captain Harlock)
4) Kamui Fujiwara (Dragon Quest: Emblem of Roto)
5) Yukito Kishiro (Battle Angel Alita)

[RaGNORAK]

1.Kentaro Yabuki (Black cat;TLR) - this nomination was entirely for black cat ,well maybe a little for TLR too
2.Harold Sakuishi (Beck) -regardless of what gin says its a very awesome manga
3.Nobuhiro Watsuki(rurouni kenshin) - really liked the story and the ending was well timed
4.Ryuumon Ryou(bloody monday) - nice plot
5.Sakurako Gokurakuin(Sekeri)- ecchiness. nuf said

people i couldn't add because of the non-mainstream criteria : oda(OP) , and Norihiro Yagi(claymore).

[damnz]

Hm... too many great mangakas for a top 5...

- Naoki Urasawa (20th Century Boys, Monster, Pluto)
- Takehiko Inoue (Slam Dunk, REAL, Vagabond)
- Harold Sakuishi (BECK, Under the bridge)
- Makoto Yukimura (Planetes, Vinland Saga)
- Yasuo Ohtagaki (Moonligh Mile)