As how The Inferno was written, you will see how vague Gustave Dore was in describing the details of Lucifer. It’s seen that Satan/Lucifer has no actual character, but rather a form of negativity and mockery of the Holy Trinity. The body is also shown to be stuck up to the waist which made it vague, but some experts agreed on the fact that it shows the futility of people’s immobility towards their life if they don’t move on to improve it. Therefore, it shows that Lucifer is being depicted as evil, and that evil means a man being useless in their life.