Making game characters (based on real people in history) for an educational game; is it Halal?

I am a game artist. I make different types of **characters** for a game. Our team is willing to make a battleground game where gamers can learn about history by playing this game. If I make different types of characters like *Hitler* or *Abraham Lincoln*, is it **Halal**? What does Islam say about my perspective? Please answer in **details**, I am really worried about it.