Dante vs Vergil.
Vergil's Motive
Dante's older twin brother. In contrast to Dante, he is the type who dislikes a commotion. He seeks power as a demon successor to Sparda, and plots to open the gate to the demon world with Arkham. However, Vergil is also a successor to Sparda's bloodline. Certainly, it is not the case that he desires demonic power in order to invade the human world - his desire for power comes from a genuine feeling of wanting to become stronger. As a result he is used by Arkham, and he alone falls into the demon world, where he challenges Mundus to battle, but is defeated.