can we have a Reaper as one of the Demigods?
he could have a special ability that makes him a bit weaker than other Demigods at the start of a match, but as the match wears on he grows more powerful from feeding off all the death around him. it would make him good for long matches and add some more strategy (how long do i think this match will go for?)

I like the idea of drawing off of death for energy, but not in the way a necromancer would,by resurrecting the dead, rather that the release of a life strengthens another.
Though I don't think it should be a permanent thing, something like this:

Soul Reaping(gee, that isn't the exact same name as a certain necromancer-only attribute in Guild Wars is it?)
-The reaper gains a momentary boost of strength by drawing on the released souls of his slain foes and allies, Gives the reaper +X damage bonus and +X armor bonus for 15 seconds per enemy dying within X radius around the Reaper, this bonus is quadrupled when a demigod dies, bonuses from soul reaping stack up to +X armor and Damage
(X depending on the level of the skill, whichever ends up being balanced the 15 sec duration might change too, might change for when a demigod dies.)

But really I think that would be a grrrrrrrreat game dynamic, it would be an awesome way to encourage teamplay, perhaps the reaper needs at least some death going on around him to be remotely effective, and will rarely ever win a one-on-one fight but once, say, the torch bearer firebombs a group of minos with the reaper nearby, The Reaper (cackling maniacally) runs to the nearest rook, does enough damage to scare the **** out of said rook, right before being reduced to a weakling again.

The reason I'm against the whole "Reaper gets absolutely awesomer over time" is that it would basically either end up being no different than leveling a normal demigod and getting more powerful with each level. you were a little vague, but you made it kinda sound like the team with a reaper would just turtle as effectively as possible until the reaper just charges out with ridiculous stats. Tell me if I misinterpret your idea here.

i sort of meant a small bonus, like 10% or something in a long game, have it capped at 10-20% better than a normal demigod. it would make it sort of like a small game ender in FA - you know your opponent is building one, so you take them out fast

it wouldn't be a big enough bonus to really tip the game one way or another, but it would be a good option for turtles, not a game-breaking overpowered freak of nature

I could see this as a possibility