I'm looking for those manga that have an anime series. ex:
Naruto
Bleach
One Piece
Hayate no Gotoku
Ouran High School Host Club
Wallflower
Zero no Tsukaima
Maburaho
Majikano
Karin
Midori Days
To Love_Ru
Kodomo no Jikan
Samurai Deeper Kyo
HSD Kenichi
Rosario to Vampire

...I'd prefer shounen, ecchi and comedy. Also somewhat recent anime, something from year 2000 up to now. And romcom shojou would be ok, so long as its rotflol funny.

And something with exelent anime potential like Mx0 would be good, but it has to be shounen.

Nagasarete Airantou
Mahou Sensei Negima
Air Gear
He is My Master

All Shounen, Comedy, and Ecchi. I'll add when I can come up with more.

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Lovely Complex is definitely a rofl romcom.

Skip Beat (It will be be later in October. : o)
Get Backers
Love Hina
DearS
Ichigo 100%
Inukami!

It's not shounen or ecchi, but Mushishi is the best manga to anime adaptation I've seen.... another good one is Gunslinger Girl.

Kurenai has a manga as well, but it was originally a light novel.... anime is the best, in my opinion.

ToraDora is getting an anime adaptation in the coming weeks.

If you strictly want something generic and shallow, probably to Love-ru... I don't go anywhere near it, but I think it seems to fit what you're asking for.

Point & Squirt

If you liked Zero no Tsukaima, you'll probably enjoy Shakugan no Shana as well, similar premise, same voice actors.

No mention of Fullmetal Alchemist? Odd. Anyway, you've probably seen/read it, but if you haven't pick it up.

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