• Bokura Ga Ita
• Deel Love - Pao no Monotagari
• Deep Love - Ayu no Monotagari
• Deep Love - Host
• Deep Love - Reina no Unmei 
• Koizora
• Heaven’s Door (Hongou Ranko)
• Touch Me Again [yaoi/shoune-ai]
• Doushite Namida Ga Derunokana [yaoi] 
• The Carp on the Chopping Block Jumps Twice [yaoi, but I really cried so much over this one… haha]
• Absolute Boyfriend
• After School Nightmare
• Paradise Kiss
• Flowers of Evil
• Eichi (http://mangafox.me/manga/eichi/)

Yeah, I hope this helps~ P.S. I’m a sensitive person, so these may not be all that sad. Just a warning. hahah 

Velvet Kiss
Kaikan Styling
Darling wa Namamono ni Tsuki
Ai Girl
Mousou Fuuki Iin
Rhapsody in Heaven
Honey x Honey Drops
R-18
Venus ni Arazu
Beast Harem 

I don’t know which ones are well-known, so I’ll just give you a list of some that I have read and enjoyed.

Half and Half
Hana no Kishi
My Boyfriend is a Vampire
Magnolia
Afterschool Nightmare
Biyaku Cafe 

Strobe Edge
‘Hajimete’ Ageru!
24 Colors
3 Hearts
7th Period is a Secret
Absolute Boyfriend
Afterschool Nightmare
Akai Michi
Ore no Subete ga Kimi no Mono
Love Berrish!
Hatsukoi no Tsuzuki
Kare Kano
Houou Gakuen Misoragumi
Love Zipper
Watashi no Koibito
Eichi
Papillon - Hana to Chou
Confession Game
14R
Beauty Pop
Chocolate Cosmos
Otona Pink
Otokonoko Zukan
Cyboy
Tokyo Kareshi
Hana no Kishi
Suits no Kuni
Kanojo no Honnou
I Love HS
Tobenai Tori
Rhapsody in Heaven
Sweet Black
Nineteen, Twenty-One
Shounen Butterfly
Honey x Honey Drops
A Small Sheep Dreams
Veins 

Welcome to Room #305!
Kangoku Gakuen
Ookami Shoujo to Kuro Ouji
Ao Haru Ride
Perfect Girl Revolution
Usotsuki Lily
Darling wa Namamono ni Tsuki [ridiculously funny but in the perverted sense]
Karneval

I don’t know. I hope these help. They’re only mildly funny to just entertaining-funny. haha

Life is Money
Guilty Crown
Liar Game
Mirai Nikki
1/2 Prince
Ao no Exorcist
Livingstone

Eichi
Otona Pink
Kinkyori Renai 
Chocolate Cosmos
A Beautiful Fascination is Better Than Love
7th Period is a Secret
Ai no Koe
Otona no Shoumei 
Biyaku Kyoushi [smut]
Genshoku Tsundere Danshi Ikenai Sensei
Kanon (USAMI Maki)
Onegai, Sensei [collection of one shots]
Flying Bunny [one shot] 
Dakara Koi to Yobanaide [one shot]
Akahime Ranshin [one shot] 
Daisuki Datta yo, Sensei [one shot]

I don’t know what’s well-known, haha, but I hope this helped.

Kare First Love
Strobe Edge
Kimi ni Todoke
The Wallflower/Perfect Girl Evolution
Dengeki Daisy
Doubt!!
Kimi wa Pet
Charming Junkie
The One
Lovely Complex
1/2 Prince
Akuma to Love Song
He’s Dedicated to Roses
Beauty Pop
Switch Girl!!
Hana no Kishi
L-DK 

Cyboy (guy)
Denkou Sekka Boys (yaoi)
Doubt!! (girl)
Garasu Bijin (girl)
Gokupuri - Gokudou no Oujisama (guy)
Hana Sakasu Te (girl)
Himitsu no Ai-chan (girl going from tomboy to girly)
Kare First Love (girl)
Kimi wa Girlfriend (girl)
Kirakira 100% (girl)
Kirei no Tamago (girl)
Koukou Debut (girl)
Kyou, Koi wo Hajimemas (girl)
Love at the Fingertip (girl)
Mairunovich (girl)
Mishounen Produce (guy)
Namida Usagi - Seifuku no Kataomoi (guy)

Iyada Nante Iwasenai
Kindan no Koibito
Konya, Kimi ni Ai ni Iku
Sakura Irony
Suki ni Naru Made Matte
Kanojo no Honnou
Kinkyori Renai

I can only think of these for now c: 

Kimi Wa Pet
Sekine-kun no Koi
Kare Kano
Cat Street
The Emalmer
A Small Sheep Dreams
NANA
Paradise Kiss
Cousin


I don’t know if this is what you asked for, but those are some manga that I found meaning in and could relate to deeply.  

I LIKE YOU AND THIS QUESTION
This is the first time somebody has asked this. orz

Chiro Star Project
Houou Gakuen Misoragumi
CODA
Pheromomania Syndrome
Charming Junkie
1/2 Prince [I liked this manga instantly and I read all of the current chapters in like one day. -__-“]
Sazanami Cherry
Hana no Kishi
My Boyfriend is a Vampire
Bokura no Kiseki
Hana Kimi
Ouran Highschool Host Club
Usotsuki Lily
Renai Idenshi XX
Charisma Doll
Hanayashiki no Juunintachi
Gekkou Teien
Clear Up After Rain
Ingenuo
Savage Garden [beaaaaautiful art]
He’s Dedicated to Roses
Kanojo ga Cafe ni Kayou Wake
That’s Why I Sigh
Seijou Kouchakan no Jijou [Reaally liked this one]
Teppen!

:)

Anzora Yell
Koibana! Koiseyo Hanabi
Kisu, Shite Ii desu ka…? [Oneshot]
Oretachi ni Ai wa Nai
Inochi
Watashi ni xx Shinasai!
Darling wa Namamono ni Tsuki [HILAAAAARIOUS]
Koakuma to Meromero Tengoku
Venus wa Kataomoi 

*I might update this at another time. I haven’t had a whole lot of time to check out manga lately due to vacation and school preparations, so I hope these few help. 

Oh, wow, thank you. haha You really saved us some time. :p 

*And I’d like to add Himawari to this list.