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Requesting that houjin_exaxxion and cannon_god_exaxxion should be somehow related. The latter exist but is empty now. Of the 4 posts tagged with the first, 3 have "CANNON GOD EXAXXION" or "EXAXXION THE CANNON GOD" written on the image.

The 4th one... https://chan.sankakucomplex.com/post/show/1028820
... I don't recognize anything/anyone in that image that is in the Exaxxion manga series, I believe the tag is an error. So without the 4th, there would be a 3 out of 3 = 100% match. (I don't know what "houjin exaxxion" means, it's probably the original title of the manga series, or rather, the romanization(?) of it.)

Thinking about it, and given that my guess about "houjin exaxxion" is true, it would probably work best if cannon_god_exaxxion would imply houjin_exaxxion, but not the other way round. Then mass-edit the tags of the 3 images to cannon_god_exaxxion and it's done.