It doesn't have to be the main character as long as they play an important role in the story.
I would be great if they have strong personality too.. a.k.a ambitious or give vibration of someone above / royalty.
I find them mysteriously enchanting ★~∩(o ∩)
These are my favorites:
Dimitri - Kuro Bara Alice
Izumi - Gantz
Takumi - Nana
Rai - Noblesse

..
If you found those above a bit difficult
someone like Ren -Skip Beat! or Sebastian -Kuroshitsuji could work too..
but if it possible I would want the long hair guys..

So,,, anymore of these guys??
please~
thanks before!

[img]https://i.imgur.com/lHjrfaR.jpg[/img]

Eros - the one
Kanda- D.gray man
The dad- Romance papa
Kaname- Vampire knight
Reino- The Queen's knight
Many of em(drools) in- Saver

Thats all i can recall for now. I'm sure there are many more I'm missing out on :'(

Beck - Ryusuke
Death Note- L

Luka from Uragiri wa Boku no Namae o Shitteiru.

I'm pretty sure the protagonist in Teen Spirit fits too.

Count D from Pet Shop of Horrors.

Crazy Girl Shin Bia main guy has wavy, long black hair.

Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus

Evyione (merman king) or Tenma no Ketsuzoku (Mongol king) should hit the sweet spot.

Avatar by tassyn.livejournal.com

Reading: Kingdom, Sangokushi, Historie

Kira Sakuya from Angel Sanctuary
My fav character of this manga btw <3
uhm maybe also Oda Keiji from Oishii Kankei
both Eros and Angus from The One
Gennosuke and the whole lot of others since it's about ninjas - Basilisk
the same goes for other 'somewhat-historical' mangas with samurais and shinobis (plenty of men with long black hair, except they're not always qualified as bishounens ;p)
Ibuki from Kare no Ondo (at the beginning at least)

and last bot not least: Zura... ooops, I mean Katsura from gintama 😀 😀

the genres are rather diverse but they're all good titles worth reading 🙂

Kurama aka Shuishi Minamoto on YuYu Hakusho. He has long red hair. 😀

Yuzuru in Penguin Revolution x)

Luo Kai, the drummer in the band from Youth Gone Wild.

Haji from Blood+
Tyki Mikk from D.gray man
lucifer from angel sanctuary
Sebastian from Kuroshitsuji
Kaname from Vampire knight
eros lanson from the manwha the one
I also find Hei from darker than black very cool

thats all I can think of right now but I'm sure there r plenty others 😉

ps: Rai is my top one manga hottie, u wont find anyone like him even if u search the entire MU 😁

Hinata no Ookami - Hijikata

If I find more, I'll edit.

Edit:
The main in Sable Prince
Ichiyo in Zanbara!
Shirokuro Kitan
Sarashi Asobi
... Gil from Pandora Hearts?
And I'll second D.Gray-man. There's a good amount of long-haired guys in this.

current state : excessive drooling
thanks guys! there are some titles i haven't read yet, now i'm confused which i should pick first :lol:
I like Gil & Kanda : drool :
L from death note... you really missed the target.
I haven't read teen spirit... i must read it, now!
@Rinnna woow, i can feel we share the same frequency, i love all those characters!

[img]https://i.imgur.com/lHjrfaR.jpg[/img]

Holyland - Izawa Masaki

Yuuzan (Main male lead's brother) from The Monster Next to Me.

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