Certification
- Australia:PG (DVD)
- Australia:M (volume 4)
- Canada:14A (Manitoba, volume 1)
- Canada:G (Quebec)
- Denmark:15
- Japan:G
- New Zealand:M
- Philippines:13+ (self-applied)
- Russia:16+
- Russia:14+ (some volumes)
- Russia:16+ (some volumes)
- Singapore:M18
- United Kingdom:15 (volume 1)
- United Kingdom:12 (volume 2)
- United States:TV-PG (Netflix)
- United States:TV-14 (volumes 4-9)