I know i'm answering this a cpl days later than the last post, so I don't know if you'll see this, but there is a game called Fate that is similar style to the Diablo series except better graphics (though bit more cartoony/anime look to it). It's rated E for everyone 10+ so definately more innocent than the darker Diablos. You even get to pick a cat or dog to be your pack mule while you dungeon crawl (though by giving it different magical food during the game you can morph it into a different creature). If i remember right you can even change the graphics option to show creatures blood as green if you don't like red.

Check it out, great game, outstanding reviews. Used to be download only but now it's available in stores. I'd recommend the demo first to make sure you like it.