Red garden finished on March 14th 2007, thus it is not an ongoing anime.
Yes.
Red Garden Requiem, High School of the Dead, Hellsing (has some zombies), & Zombie Loan.
No
Detective Conan Detective Conan is in no way the longest ongoing anime or manga series. Not even close. Sazae-san is the longest ongoing anime and Chiisana Koi no Monogatari is the longest ongoing manga.
D.Gray-man is an ongoing manga series but I don't know if the anime , at 103 episodes , is still ongoing .
Air gear is not ongoing anymore but the manga is.
http://animeready.com/anime/ongoing/inuyasha/
Well...manga is ongoing, but anime was ended.
Yes.Both the anime and manga are ongoing.It won't stop till it reaches 300+ from what sources say.
The anime series "Puella Magi Madoka Magica" has 12 episodes .
One Piece ,
Fairy Tail's original run is October 12, 2009 - ongoing