Guys, the characters you're doing must resemble original artworks as much as possible. You could do an amazon on a tiger, but she herself not having a tiger in any Diablo game would heavily impact on your score.
Some minor things that simply cannot be "fixed", such as doing Bow Amazon on any one of archers where half of them have cape which original Amazon doesn't, and none have fitting head/hair shape for her original appearance - that is tolerable, to a point. But I'm afraid adding a full tiger really wouldn't fit there. This doesn't mean that you must follow every little bit to the detail - you are free to add as much details as possible, as long as it looks and "feels" like the original Diablo char, it passes.
For Mephisto, Lich, Revenant and Sorceress (Yes, due to alphable legs and huge crown allowing horns) could work wonderfully.