Acoording to the PP, you should contact them requesting deletion 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
URLS:
http://www.comicvine.com/
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