I wasn't sure if this belongs in the anime section or manga but whatever.
So are there any mangas out there that you want to turned into an anime? I got a few
O-Parts Hunter/666Satan: This is one of my favorite action series manga and I'm currently trying to get all 19 volumes of it. The biggest problem this series has is that there are heavy similarities between this and Naruto (people sent him letters saying he was a fraud), this is because the creator of O-Parts Hunter is the twin brother of the creator of Naruto and he mentions that they had the same influences growing up. It doesn't excuse everything, like the art style being almost exactly the same, but it forgives some of the other similarities.
Psyren: This is also an action series with sci-fi elements as well, mainly time travel. The main character is a standard goku-type hero but the plot and side characters were interesting enough to keep me reading. This series and O-Parts Hunter have both ended already so if they did ever turn these into anime they would have a complete story to work with and have little need for filler.
Bitter Virgin: One of the better love stories I have read that deals with rape in a very mature way. I feel it could work really well as a 13 episode series because anymore could require some filler and I would like to avoid that.
Liar game: This is kinda cheating because it was made into live action movies but movies came only hold so such. Seeing all the different games come to life would be amazing. It has a Light/Lelouch type main character but a lot less egotistical which makes him much more likable. And some of the games they play are just a good mind trip.