I have an awesome idea for a zombie video game. I call it
Necrosis: City of The Dead
It would combine both elements of real time strategy with first person shooter action. Think something massive like World in Conflict but instead of being stuck in the 3rd person omnicient view, you can cycle to 2nd person view( think SOCOM or Full Spectrum Warrior where you are in a team and can direct a few guys) or 1st person.
The whole idea would be that there would be a large city where a zombie outbreak would occur and you are pretty much trying to get the hell out of Dodge or wipe out the undead. There would be a Campaign mode and a Solo mode. Campaign would have a story that you follow through but would be a bit more linear. Solo would be alot more open to the player(you can take on a whole city of zombies one bullet, crowbar, or Molotov Cocktail at a time) but you would not collect upgrades until the game is beaten nor do you have to do any of the missions to win the game. The objective would be either leave or cleanse the city.
You could either play as National Guard, police or civilian and each would have their pros and cons. Also, you would be able to choose what gender your character is, facial features etc.
The characters would have a realistic loadout of weaponry. None of this ridiculous amount of ammo thing going on or being able to hump a M240B, a shotgun and a rifle and still being able to run as if you were Usain Bolt.
Injuries would be a bit more realistic too. None of this "touch a medkit and now you are Morphine Joe who can survive almost anything" nonsense. You could do field surgery like in Metal Gear Solid 3 but your injuries would take time to heal; a couple of days to a couple weeks depending on the severity. Injuries would hamper your abilities; if you got a broken leg, you would be limping. If you got flak in your arm from an explosion, your accuracy would be degraded if you tried to fire a gun or swing a bat. Medkits would be few and far between and would be found in realistic places like in a car trunk or in a medicine cabinet. No gratuitious amounts of pills like in some games.
Weapons improvisation would be part of your abilities. If you wanted to hijack a car and plow over some dead fucks but it's missing the keys, you could hotwire it. If you wanted to make a Molotov, you can pick up some gas, combine it with a bottle and a rag and poof! You got a Molotov.
Environmental interaction would be more realistic too. If you shoot a wall, the hole would be permanent. If you are tasked with rigging up explosives, when they blow, they would leave a crater and not a black smudge. If you toss a brick of C4 into a house, it would fly to pieces. Grenade wounding radius would be more realistic as well.
I think all of this combined along with some other ideas would go along nicely in a zombie game.