Gungrave uses the same visual styles and camera angles as DMC. They have a similar storyline and the main characters (Grave in Gungrave, Dante in DMC) were designed to look similar.
The character of Alastor is a direct reference to Dante in Devil May Cry. He looks like Dante, and his moves are similar to Dante's. Also, Alastor was the name of Dante's sword in DMC.