Danbooru-based image board with a specialization in high-quality images.
berserk male monochrome monster tagme zodd

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We need some type of 'monster' tag that people can blacklist if they want.
Danbooru has this type of thing tagged as monster and the manga/anime Monster tagged as monster_(manga). We could do it like that if you want.
Unless there are any objections I'll tag these types of scans with 'monster'

Blacklist that tag if you must.
I can already imagine what people will start uploading...
You mean like Pokemon/Yu-gi-oh monsters? They'll still get deleted if they are low quality/low res.