Kirito(Sword Art Online) vs Sora (Kingdom Hearts)
Red Hood vs Phantom Menace
Gandalf vs dumbledore
Death/Grim Reaper Death Battle
Gilgamesh from fate stay night series vs. Madara Uchiha would be a completely epic fight and Lelouch vi Britannia from code geass vs. Char Aznable needless to say both should be leading there armies
Sonic the hedgehog vs Sonic.EXE
Seeing as we had a Death Battle with Link VS Cloud, why not have a battle of the main villans of these two universes as well? Ganondorf VS Sephiroth. Then again we probably already know who will win considering who's fighting, I only know Sephiroth's stats to a great extent, however i might not know everything so i'm rather curious as to what information we will see about him. I do not fully know Ganondorf's stats or capabilities, but maybe i might learn more about him in what you find. I am mainly placing this battle here considering that Link defeated Cloud, so maybe Ganondorf could challange Sephiroth? Probably not sadly, but still, it's worth a try to see what happens.
Spider-man 2099 vs. Batman Beyond Terry Mcginnis
Dr. Polaris vs Magneto vs Solva
Madara vs Itachi but both only with MS an around the same age of 17. I only say that since Itachi didn't live long an didn't have EMS. Itatch has the prowess Madara has experience.
Punisher vs golgo13
Or Lara Croft vs. Nathan Drake?
Green Arrow vs. Hawkeye
Or maybe Starfire (DC) vs. Silver (Sega)?
How about Ganondorf (Legend of Zelda) vs. Ares (DC)?
Future Trunks vs Booster Gold
Ben (Death Battle a.k.a. Wiz) vs Akira Toriyama (Dragon Ball's creator). Just get Wiz to fight the whole Dragon Ball supporters who couldn't drip the Superman winning the battle against Goku!!!!
Straw hat luffy vs Ichigo kurosaki