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Genex said:
"halo" is already taken as a copyright tag. So "angel" to describe a halo has to do.
It's not only Blue Archive, but Cirilla of Azur Lane that's tagged this way.
That's quite a decision about tag meanings. Compare that to my idea of angel being the not-quite otherwise-strictly defined opposite of devil. Try searching the posts for combinations like https://yande.re/post?tags=devil+angel+-rating%3Ae+-blue_archive

Such approach would mean the "angel" tag denoted a comparatively deep fetish object. There's no such fetish for just an overhead marker.

But, I've had been rebuffed before with my tendency to look for fetish potential as justification of existence and peculiarities of a tag.