Possible Clues:

• I, V, X etc
• CD and XL, for example
• V, X and C
• Eg, I, V, X, L, C, D, M
• Maybe MCC type runs male out
• What all the consonants in the names at 14-, 17-, 25, 50-Across and 37- and 39-Down are
• In which four can be seen in five?
• I, V, X, etc
• Vivid characters used to count as such?
• What DCI and XII are