Kratos:

Gerard Butler, because he did 300, which means this wouldn't be too big a jump for him, plus he looks the part already.

Ares: Liam Neelson

He can make a good bad guy, like in Batman Begins, and he kinda reminds me of Ares in Star Wars The Phantom Menace, with the long hair and the beard.

Athena:

 well since this is for the first game only ( GOW2 cast will come in next blog), we can use special effects, since she never appears in true form until GOW2. They should just use her voice actor and use computer animation.

Poseidon:

I would give this one to an unknown actor, because I cannot think of anyone else. Or just use his VA, kinda like Athena.

Zeus:

The guy who played Dumbledore in the new Harry Potter movie. they look alot alike. I just hope he is in good enough shape for the fight scenes in GOW2.

Hades:

VA and special effects again.

Kratos's Wife and Child:

unknown actors, they won't have much camera time.