Board Thread:ROBLOX help and discussion/@comment-17120436-20140922034428/@comment-4196050-20140922110211

If you are talking about the most appropriate namespaces, the (Main) mainspace (Top 100 Forum Posters) would be the most appropriate or, if a lot of the top 100 users also meet the notability policies and have mainspace pages (Community:SoandSo), you can also consider making the top 100 page a category page (Category: Top 100 Forum Posters) and linking that category to their associated pages.

If you are talking about categories associated with the page, ROBLOX Forums would be an ideal starting-off point for categories.