OVAs (Original Video Anime) are small spin off episodes of established series. mostly they highlight bit characters or extra story line to the parent series. Other times they offer "What if" scenarios (like Ed's Grand kids OVA). They can be stand alone episodes, hour long specials, 3-6 part series or even movies (if i recall right...).
Here you can suggest ideas you would like to see. Feel free to make up silly ones for your own amusement.
Personally there are two I really want;
1) Social Welfare agency meet Lagoon Company. (Series: Black Lagoon and Gunslinger girl. 30 min-hour long show)
Balalaika has business in Rome and hires the Lagoon company to be a scout group (go to Rome first and make sure things are safe) while Hotel Moscow is still getting ready. Italy's SWA get wind of this and decide to eliminate the Lagoon Company in hopes it stops Balalaika and her boys from coming along.
Plot doesn't really work but this is really about the action. The idea of the Gunslinger girls facing off against Revy and Dutch is great. Better through in Eda and Shenhua as well for balance.
2) Matsuda and the Cheif (Series: Death Note. 3-5 half hour episodes, maybe an hour long finale including a fight in a clock tower)
The simple premiss is a parody of the old 70/80's cop shows (set in an alternate universe where certain people didn't die) with the older "by the book" cop and the younger "willing to use underhand/immoral tactics" cop.
Every episode they deal with two cases. One is wrapped up in the episode and the other, a killing spree, carries through the series and is dealt with in the finale. (Death notes and Shinigami may be involved and Near/Aizawa or Melo may make an appearance.) Through Yagamis use of old school methodology and Matsudas "street smart" (a point of endless clichéd comedy) they will solve each crime with gutso. At the end of each episode someone will make a lame joke and everyone will laugh.
And in a special role written just for him Mogi will play a friendly pimp, much like Huggy bear.
Now lets hear your ideas.