As I had discussed in the previously mentioned topic, fictional persona is, in effect, a failure of a tag because it was born out of an unnecessary need to distinguish fictional self-inserts from reality-representing self-inserts, something which basically everyone ignored, until it got appropriated for MMO purposes and altered to fit its new purpose.
For all intents and purposes, I personally agree with just nuking both, rather than aliasing one to the other, because it returns it to the status quo where its use was ambiguous and purpose even less clear than it is now.
For fictional persona, having an overarching tag for original player characters seems like something people would not search for (notwithstanding whether there is a Pixiv tag for 'em). Rather than nuking outright, I'd propose an alternate solution I had made in topic #18615 in the context of those MMO race tags:
The only viable alternative, in my eyes, is creating player_*
(or player_character_*
, but the former has precedent; alternatively, avatar_*
also has precedent) tags for each relevant MMO and turning the race tags into gen tags. That way, you can pair that tag with either a race tag or a class tag in order to narrow down your search (this would also help with some of the complaints I've heard about Monster Hunter tagging and its current method of character tagging).
That still wouldn't change the fact that many race tags are, even with tag gardening, going to be tagged with meta knowledge, canon tagging (same with class tags).
Having such chartags would effectively fill out the gap fictional persona would have and would unambiguously reveal what that character's status is, without necessitating someone to check the gentags, especially given how the distinction between "player character"/random OC is a bit arbitrary, because artists would likely touch up their player character in art to make them more representative of what they truly want said character to look like. Once said chartags are made and fictional persona gardened, it can be safely nuked.
On alternate persona, I do still think there's a use for a tag with its concept, as I said in the last topic;
...we don't have general tags that collect together things such as fursonas[, OCs by folks who don't draw themselves,] and the like that would go under a tag with that definition, and you can't put it under artist self-insert
because the art could also be commissioned, thus theoretically belonging to borrowed character
despite that being for artists drawing another artist's character.
I think there's a place for such a tag on Danbooru, though what sort of name it would have is another question entirely (maybe just invoke the fannish term sona by itself, but that isn't broad enough a term for our use).
The fact that we're for some reason discussing IP-derivative not-player OCs in the context of either tag, when to my knowledge neither tag was ever used for such characters due to being obscure and useless tags, goes to show their failings just as my examples in the last topic had.