it would be easy to make that silent assasin type demigod from samurai or ninja. Samurai ofcourse could use katana as his weapon. and he could make backstab kind of attacks and flee quickly. ofcourse he should have fewer hp than other because he can escape more easily. if you want to make it more ranged then you should take ninja type instead.
But i think it would be cool to have minotaur like demigod, which would have big axe in his weapon and somekind of stomp ability to stun enemies. I also got another idea, which i think would be coolest thing in the game and i would be very man like, which everyone have asked before this post. And it would be Viking like demigod with double axe.
also one suqqestion for ranged type could be centaur demigod, with spear ranged abilities. and have somekind of rush ability, that would stun enemy demigods for awhile, so it could be used support demigod. But i think the game lacks at the moment flying units totally and they should be done. they could fly over small obstacles like canyons. so they could escape easily but ofcourse the balance should be maintained so they should be more fragile so it could be killed even it could make escape more easily than other characters.
if you have some ideas please share them with us.