The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- March 6 Births (1 member)
- Marvel Universe (395 members)
- Masters of Silence (3 members)
- May 12 Births (1 member)
- May 13 Births (1 member)
- May 14 Births (2 members)
- May 16 Births (2 members)
- May 19 Births (1 member)
- May 1 Births (1 member)
- May 20 Births (1 member)
- May 22 Births (1 member)
- May 25 Births (1 member)
- May 28 Births (1 member)
- May 29 Births (1 member)
- May 31 Births (3 members)
- May 4 Births (2 members)
- May 5 Births (1 member)
- May 9 Births (3 members)
- Mecha (1 member)
- Media and Entertainment (1 member)