Like the title says. I want a male lead who is awesome at everything up to the point of badassery. The guy being badass is most welcome (being modest is welcome too) and so is romance and action in the series.

Please no: Hentai/Shounen-ai/Shoujo-ai/Reverse-Harems(1 girl + multiple guys)

Preferably the series should be shounen or seinen (it's not a must).

Examples:
Hayate no Gotoku
Isekai no Seikishi Monogatari
Mahouka Koukou no Rettousei

Definitely Id

This is a novel but this has your I-am-great-at-everything protagonist. The Legendary Moonlight Sculptor (Novel)
Vampire Juujikai may be

I second Id

Beelzebub plus 40%-60% of my lists (to lazy to sift through them XD)

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

Strong:
Chrome Shelled Regios (Novel)
Densetsu no Yuusha no Densetsu (Novel)
To Aru Majutsu no Index (Novel) (It has it's badass moments)
Noblesse
Berserk
PSYЯEN

Intelligent:
Heavy Object (Novel)
Bloody Monday
Mx0

Intelligent + Strong:
Mahouka Koukou no Rettousei (Novel) (I will throw a tantrum if someone finds the manga better than the Novel )
Trinity Seven: 7-Nin no Mahoutsukai (not sure)

Others:
Sket Dance (kind of?)
Team Medical Dragon

Please let me know if this was of any help. I am not too confident in these kind of recommendations.

@blackgamer i find Mahouka Koukou no Rettousei manga better cause i haven't read the novel XD

anyway on topic, sifted my lists out of boredom, here's some of my faves
Crows
City of Dead Sorcerer
Special Martial Arts Extreme Hell Private High School
Crimson Grave
Kuroko no Basuke
The God of High School
Koko ga Uwasa no El Palacio

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

...Does anyone mind if grafix disappears from earth? I'll gladly send him to another world.

Don't take it too seriously, but read the awesome Novel instead of the horrible adapted Manga. I beg you, give the Novel a try...

i am not very confident with my answers, so sorry if its not what you want!

Angel Densetsu - all around a wholesome highschool boy
Eden: It's an Endless World! - good at killing.
Marie no Kanaderu Ongaku - blessed by the goddess
Death Note - extremely intelligent and possess a magical book
Majin Tantei Nougami Neuro - intelligent demon
Freesia - awesome at killing, not awesome at thinking straight
Jiraishin - super cop
Koroshiya 1 - extremely awesome at killing
Shin Angyo Onshi - a perfect general
Hakushaku Cain Series - sleuthing count with great affinity to poison
Kyou kara Ore wa!! - school delinquent, that is somehow great in fighting.
Zippy Ziggy - egotastic high school boy
Jesus - legendary assassin
Mahou Sensei Negima! - 10 year old prodigy
Hunter x Hunter - moar 10 year old prodigy
One Outs - good at baseball, great at gambling
Yureka - have awesome avatar

lol black, if the novel comes out in english (not scanlated online but in actual bookstores) ill be more willing to read it, its annoying trying to read novels online. unless you can link me to a site where its properly paragraphed and not jumbled

and back on topic, heres a couple more
Denpa Kyoushi
Kateikyoushi Hitman Reborn!
Black Cat
Kami nomi zo Shiru Sekai


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

You can download pdf and epub versions which I would assume are properly formatted... and then read them on an ereader (which are so inexpensive now that there's no reason not to have one). I use calibre to manage my ereading material, and it's usually capable of auto-formatting internet content and badly formatted works if necessary... though sometimes I've had to get a little creative.

Not that I read light novels... the only ones I've felt compelled to read (and purchase) are the first couple Juuni Kokuki books.

some Manga with "Main lead who is awesomely strong at fighting"

Doushirou de Gozaru

and

Ocha Nigosu.

lol i like this sub-topic about Mahouka Koukou no Rettousei. but yeah, novel spends too much time explaining stuff, so i like the Manga better, i i'm up to Ch 8 of the novel and just had to stop.


Anyway about badass leads that can do anything.

Noblesse

Iris Zero - Been awhile since i read this one, but i think it might fit from what i remember. but could be wrong.

I second Noblesse and Id and recommend The Breaker.

@jedinat its too much effort to download onto my kindle, lol

@Zarallx i know what ya mean, cept i didnt even manage 1 page on the Baka-tsuki site, it was too "wiki" style

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

Well I don't respect that attitude when it comes to facilitating ones entertainment at all... unless you're just not interested in the work to begin with, which is completely understandable.

I deal with a lot of relatives/acquaintances who just can't be bothered and want me to set up their entertainment for them, lol. Suffice to say, most of them just watch TV when I'm not involved.