Describe Commodus, from Movie "Gladiator"

Commodus changes for the worse. He is innately devious and this is not resolved throughout Gladiator. He identifies his main adversary as Maximus, his father's favourite, but in reality it is his own lack of moral fibre that is his greatest enemy. Maximus's fallicious death triggers a surge towards a more confident, vehement Commodus, but when Maximus resurfaces there is a resumption of his initial personality. As any emergence any improvement retracts.
Maximus's strengths are Commodus's weakenesses. Commodus realises this and holds Maximus in contempt. Maximus is everything Commodus aspires to be. Whilst Maximus's glass is full of orthodox qualities, Commodus's is almost empty, apart from a few unvirtuous qualities he embodies. It is this emptiness that makes his lack of moral fibre so transparent. Marcus Aurelius sees through the glass and intends to deny Commodus succession by reverting Rome to a Republic. …