I do not think this would be a practical tag at all. Not even considering the fact that the tag would apply to a significant part of the website, given how many non-human humanoid tags suffer from canon-tagging or otherwise feature attempts at canon-tagging on the regular, this would be an absolute disaster of a tag (and this isn't something that can be solved by writing restrictions in a wiki, because most folks do not read the wikis of what they're tagging, and most folks wouldn't tag anything if they were a wiki-reading barrier). We've literally had attempts to kill the human tags that exist for fantasy settings in topic #21464, which survived because those tags were used to represent characters who are in the minority; meanwhile your tag is going to apply to hundreds of copyrights where nonhuman humanoids represent the majority, lumping together so many things that most folks theoretically interested in your tag would just search for individually.
What evazion said recently, about how "the end result [of our entire philosophy of tagging] is every tag gets twisted and diluted into the broadest, most meaningless thing possible," feels relevant here, because while this isn't an old tag being broadened into unusability, this is a new tag that would immediately fit the bill, a tag that just exists because someone decided it has to even if no one would ever willingly use it themselves. And I say this knowing that, if it is accepted, someone, whether you, willes, or someone else, is going to inevitably imply tons of tags to it. It's going to be a tag that is only added through implication.