How to remove your Comic Vine account
Acoording to the PP, you should contact them requesting removal of your account/data: https://cbsi.secure.force.com/CBSi/submitcase?template=template_privacygl&referer=privacygl.com
However notice, as is mostly the case, they may retain some of your data due to legal reasons. More info: https://cbsi.secure.force.com/CBSi/articles/FAQ/CBSi-Privacy-Policy?template=template_privacygl&referer=privacygl.com&data=&cfs=default#Access
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Comic Vine using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Comic Vine. Click here to find out how.