I think somebody has already mention Olimpos, I second that, as long as you're fine with androgynous (like really androgynous) characters.
Banana Fish is pretty different, and I don't think I've ever read anything like it. I read it a pretty long time ago though, so I don't remember perfectly, but I think it's just a little violence.
Shigeshoushi is about an embalmer.....by the same author,
Beautiful People.

DOLL: IC in a Doll
Bambi and Her Pink Gun


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So many of these aren't unusual at all and are typical otaku shit, way more than you'd expect, ugh...I guess everyone must have a different definition of mainstream.
Anyways, seconding Kokoro no Kanashimi and adding Kono Sekai no Owari e no Tabi by the same mangaka, Space Ship EE, and Travel.


Typical otaku shit.

Last edited by spikebaby at 1:28 pm, Feb 15 2013

Mysterious Girlfriend X is pretty much as bizarre as you can get (in my opinion)
Also Melo Holic goes very far from mainstream at a point

Annarasumanara
Kisswood
Molester Man
Yureka
Kiwaguro no Brynhildr
Bowling King
Jisatsutou

Last edited by bamba4life at 4:06 pm, Feb 13 2013

Haruka na Machi e
Tamashii no Futago
Shounenshoujo Ryouryuuki
Kagerou Meikyuu - A little more popular than these others
Gekiga Hyouryuu
Iguana no Musume
Mikai no Hoshi -I thought it was weird
Zoo (Novel)
Rakuen
Kokoro no Kanashimi -third..
Railroad
Astral Project: Tsuki no Hikari

More:
A Simple Thinking About Blood Type
Kakusan
Stardust Memories
Mozuya-san Gyakujousuru
Human Clock

Last edited by SilentFaltrnLesrWatr at 9:44 pm, Feb 13 2013

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I also recommend Molester Man
And also Tsunbaka
Or maybe Metro Survive and Life is Money
The problem is...
whats "mainstream"?
Is it Naruto, One Piece and Bleach?

This thread made me think of Ryuuguuden...
Now should you read the thing is another matter.

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"I'll shut your mouth~~~~~ with mine~~~"

二息歩行

Everybody should read Ryuuguuden, because it's fantastic. Paperakyu by the same author is also worth reading.

Now, if you'd be satisfied with finding some of the least-commonly read series (available in English) among the MU community, you could try to find a copy of the following, all of which are offbeat collections of oneshots currently on fewer than 15 complete and custom lists:
Manga
New Engineering (same author as Travel, recommended above by spikebaby)
A Single Match

You could also try any of the oneshots by TSUGE Yoshiharu, or perhaps the first volume of Ax: Alternative Manga.

hmm i got to lazy to read what had been suggested after 2 posts so if these have been said.... oops

Iinari! Aibration
Alice no 100°C C
FLCL
they just have the "wow wtf did i just read" factor lol

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stupid photobucket, wanting $400/yr just to display your images

Mononoke...?

if thats typical to you, i'd like to see what you're reading. cause it sure sounds awesome

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"I don't know everything, I'm just really good at explaining the past, so it seems like I know everything"