I have gone through the gender bending list a few times. I haven't read them all but I have a reason.

I am mostly interested in actual bent genders. I am not really a big fan of cross-dressing. (unless you count someone's gender being actually changed and them then dressing the part, cross-dressing).

I know there are some good cross-dressing manga like Magical×Miracle, W Juliet, Mai-Otome , and the like.

But I am far more interested in manga like Gacha Gacha - Secret, Jinzou Shoujo, Metamo Kiss, Tokage, Futaba-kun Change, and Asuka Hybrid.

Mature content is perfectly fine, but not required.

I am running so low on these type of manga that shorts like Kanaete Aizen and non-translated manga such as TransVenus (content warning), are fine as well. As long as I can find them.

Please include a short description or a link to it here on MangaUpdates (or anywhere as long as it has a description).

Kämpfer, it's definitely a gem.

"Thus is our treaty written, thus is agreement made
Thought is the arrow of time, memory never fades
What was asked is given, the price is paid"

Watched the anime, I guess I can read the manga aswell. Thanks.

In Boku to Kanojo no XXX the main boy and girl switch bodies.

"If you think being eaten by a carnivorous tree is something that only happens to someone else, then think again."
--Shades of Grey, by Jasper Fforde

Nabari no ou maybe one of the characters is

a hermaphrodite (spelling??) is this what your looking for?

Prunus Girl if you haven't already read it.
Nyotai-ka (mature)
Sekirei (got someone with an unidentified gender - it's clearly not the focus of the story though)
Ranma 1/2 I guess...
That's all I can think of right now...

I searched my lists for gender bender, and here's the ones I came up with. By true bent gender I assume you mean physical body change.

1/2 Prince - The main character is a girl, but takes the identity of a boy in a virtual reality game, which is where the bulk of the story takes place.
Orange Chocolate - the main boy and girl body swap
Dou Danjo!? - another body swap
Click - boy becomes a girl when he turns 16
Kakumei no Hi - boy discovers he's actually a girl
Return - male spirit inhabits female body
And I second Ranma 1/2.

Already read Boku to Kanojo no XXX (love it)
Not entirely interested in what is in the spoiler box.
EDIT: Although After School Nightmare kinda did that to me.

Already read Ranma 1/2.
Already read Return.
Already read Click
Already read Dou Danjo!? (of what I could)
Already read Kakumei no Hi.
Seen Nyotai-ka before (I cannot get a hold of a copy).

1/2 Prince is on my to read list.
Sekirei is on my to read soon list.

I heard Prunus Girl was cross-dressing (but it might be good, so)
EDIT: Nevermind, reread the description, its getting put high on the to read list, thanks!

Orange Chocolate is new. Cool.

Anything more? I already got surprised with one. 🙂

Hourou Musuko has crossdressing protagonists but transexual side characters.

You might wanna try the transgender category, too.

Quote from drolemil

You might wanna try the transgender category, too.

Oh, very nice thank you.

You might want to try Pretty Face

I already read pretty face. I enjoyed it.

I was, and am, in the same predicament as you and have found that you have to dig around a lot. A lot of the ones I found were in the ecchi category. I'll only put the ones I've read that haven't been said:

No side - Soul swap.
Family Compo - Transsexual assistants.
Boy Alice in Wonderland - It's kinda confusing, you might not want to read this.
Ichinensei ni NacchattAra
Sekainohate de Aimashou
Kunisaki Izumo no Jijou - I believe it happens only in the oneshot, but the rest of the series is a good read, too.
Wadatsumi - It happens in the latest chapter.
Bra Girl - Hermaphrodite.
Conveni-N - Gender change happens later.
To LOVE-Ru - Gender change happens much, much later.
Otome no Iroha!
Clear Up After Rain
Kedamono Damono
Laon - I haven't actually read this one, but have flipped through the pages, so I might have gotten it wrong.
Divine Melody
Boukun Tyrano-san - Male dinosaur takes over a high school female's body.
Seijou Kouchakan no Jijou
Alice on Deadlines - Scans are incomplete, finished by Yen Press.
Okitsune-sama de Chu
Birdy the Mighty
Akane-chan Overdrive - Soul swap.
Strange Mansion - Transsexual.
Hime-chan no Ribon Colorful - Magical girl.
Boku no Shotaiken
Change H - Male to female, female to male. Hermaphrodites?
Otome wa Boku ni Koishiteru - Gender change happens later.

That about all I've got that hasn't been said already. And as Draconic said, Kampfer is very good.

I care waaaaay too much... 🙁

[img]http://img121.imageshack.us/img121/6540/picsmaller.png[/img]

Already read No side. (all of it, honestly, its ending isn't perfect)
Already read Ichinensei ni NacchattAra. (to current)
Already read Sekainohate de Aimashou. (beyond current)
Already read To LOVE-Ru.
Already read Otome no Iroha! (nice for an inversion)
Already read Kedamono Damono (as much as I could)
Already read Boukun Tyrano-san
Already read Seijou Kouchakan no Jijou
Already read Alice on Deadlines
Already read Okitsune-sama de Chu (love this one, ha)
Already read Birdy the Mighty
Already read Akane-chan Overdrive (probably the first I ever read!)
Already read Boku no Shotaiken
Already read Otome wa Boku ni Koishiteru (I like the later bits, with the ghost)
Already read Conveni-N

I read Hime-chan no Ribon, which is similar to Hime-chan no Ribon Colorful.

Clear Up After Rain and Strange Mansion are on my to read list already.

I will keep an eye on Change H, and Family Compo. Bra Girl sounds futa.

Wadatsumi is being done by Taruby, so I know it will be good.

Boy Alice in Wonderland cannot be much worse then After School Nightmare.

If anyone wants more...

From my collection comes a few H ones.

Boku ga Kanojo ni Kigaetara
Proper Exchange
Aah, Goshujin-sama!!

and a few non.

Boku x Kano
Kyuuketsu Yuugi aka Vampire Game
Vampire Doll: Guilt-na-Zan
Tenshi na Konamaiki - Cheeky Angel (not a real bender, but close enough)
Marugoto Anju Gakuen
Marugoto Anju Gakuen aka After School Nightmare is confusing
Kakumei no Hi
CUTEXGUY - actually pretty good
Mei no Naisho - find out later on
Nuiguru Mix - minor, limited crossdressing, ecchi

I have more but I leave it here.