Directors trying to adapt books to the big screen are lucky, as fans dont have such a concrete mental image of the hero as gamers do. You might have read a physical description, but the difference between the two separate images of a character generated by a pair of readers can be quite astonishing. With this in mind, the director should stay very, very faithful to the games rendition of the character while adapting it to a live-action medium. No easy task, and another difficulty arises with the personality of the protagonist. Many games allow you to choose the protagonists words, and almost all allow you to choose his or her actions. With every gamer projecting his own personality onto the protagonist, its quite difficult for a film-maker to do them justice. In these terms, a character such as Nathan Drake lends himself better to adaptation because his personality is present and distinctive throughout the games, and theres very little player influence. Lara Croft, on the other hand, is largely silent in the early games (the good ones), so is much harder to represent on the big screen.