Besides the lack of an actual wiki for tentacle girl, this tag looks to be redundant of scylla, tentacle hair, tentacles itself and various such tags. I'm thinking to clean the tag out before requesting an alias to scylla (much like octopus girl was) but I'd like secondary input on if it's sensible enough to keep, which would beget a wiki and a clear explanation as to how it differs from scylla or why other tentacles-adjacent tags can't be used or created to describe the tentacles in the picture.
Yidhari isn't a scylla. Search "スキュラ イドリー" on pixiv for 0 results. "タコ娘 イドリー" gets 13, and "触手娘 イドリー" gets 17.
Feels something like the dinstinction between harpy and bird girl. A scylla requires the lower half to be octopus, tentacle girl just requires tentacles.
tentacles monster_girl is I guess a two tag alternative. 80% of Yidhari's tentacle posts have monster girl. I suppose even if it just looks like a tail, any tentacles on a girl is monstrous.
For the time being, I've rifled through some wikis and made a basic wiki for tentacle girl. A secondary question since a specific example of a character was brought up is if characters like Yidhari Murphy would even count as a monster girl. The only actual monstrous trait is tentacles attached to her lower back. We don't tag monster girl for otherwise human characters that just have cat ears or so. It even says in the wiki not to tag them that way. It seems like it would be a considerable equivalent due to lack of any monstrous traits besides tentacles.
ETA: It is also worth noting that scylla says "most commonly" taking the form of human upper torso and tentacles legs, not that it must solely be that. Octopus girl is aliased to scylla which these characters would otherwise be tagged as. Pixiv results don't really mean much, it's more important to figure out what the Danbooru tags mean. It's possible that the tag was hijacked due to the alias.
A few hours later and I don't see the vision. I mass updated Yidhari Murphy's posts with a script to use tentacle girl instead of scylla and I checked the posts of both tags afterward. I made a wiki as well to try and visualise it out. There's no difference in the results except a few outliers; general cases like post #7574673 (monster_girl + tentacles) or more specific cases like post #8105269 (monster_girl + tentacle_hair). This divide is incredibly artificial and there's too much overlap to see any usefulness here. Most of the "overlap" would be tagged as octopus girl but that's aliased to scylla.
As I mentioned in my previous post, our non-human character tags are used when a character has at least one trait resembling the animal they take after, such as fox girl being applicable to characters with fox ears (I do believe this consensus was reached on the forums but I can't remember the exact topic where it happened). The wiki for scylla only says that the most common interpretation is where the legs are all tentacles, not that it's the only way to use the tag.
I'm not aliasing tentacle girl because that will cause tag maximalists to unknowingly try and use it and in turn add scylla to a bunch of posts of monster girls with tentacles that are not remotely resembling of octopus tentacles at all. The deprecation wiki will point to scylla for octopus-like tentacles or adjacent tags like tentacle hair or simply tentacles for all other cases. If more niche cases are desired, those should be tagged, like the artificial tentacles that Rabiori (ub1Mo) has.
At the time it was aliased, the octopus girl tag was mostly populated by traditional images of scylla. squid girl also exists and has similar problems.
scylla's wiki does say "most commonly taking the form[...]", but also every character example it gives is the traditional top-half woman bottom-half cephalopod. If the tag intends to cover any "octopus girl" then the tag should just be calledoctopus girl.
(scylla's not a term I've heard before today. back in my day the term used in English-language spaces was "cecaelia". but that might still have been niche, and could have been taken over in popularity by the Japanese name for all I know)
Fair enough. I did think that might be the reason for the divide and probably should've committed to the posts I gardened out before making judgement that the tags were a superficial divide and that there wasn't a difference. I suppose the "temporary" wiki I wrote being upheld is more power to that.
