Pages can be made for actors, but should be made brief, and include only the most basic biographical information, along with their connection to Dante's Inferno. Consult this example from The Vault: Matthew Perry
A new article can be created for every weapon, gamemode, ability, level, location, named character and usable object. Where there is a very small amount of content (one line) for a large series of related topics, it may be better to make one central list/table instead. However, you should not be scared to make a new page.
Articles are not appropriate for fan websites, people not directly related to the development of the game, or unrelated games.