We probably should remove super_smash_bros._ultimate from some characters introduced in earlier games.
post #3419291 is about Palutena, which is tagged super_smash_bros._ultimate. If we tagged according to the SSB debut, basically Palutena posts should be tagged super_smash_bros._for_nintendo_3ds_and_wii (not Ultimate).
Under the same principle, Wii Fit Trainer posts should also be tagged super_smash_bros._for_nintendo_3ds_and_wii (not Ultimate).
Admittedly, the original Tumblr link uses "#smash bros ultimate" as a hashtag, so that post really was intended by the artist to be a Ultimate art. But this goes against the "tag what you see" principle. That is, I wouldn't like to give the chance for basically the same posts to get different copyright tags solely based on their Tumblr hashtags or descriptions.
It also raises the question of why can't we find all posts of Palutena and other super_smash_bros._for_nintendo_3ds_and_wii fighters by using that tag.
Should all SSB posts with Pikachu be tagged super_smash_bros._(classic)? Basically this also means that a full team-up of Ultimate fighters would get tagged with all the 6 SSB tags: super_smash_bros., super_smash_bros._(classic), super_smash_bros._brawl, super_smash_bros._melee, super_smash_bros._for_nintendo_3ds_and_wii and super_smash_bros._ultimate.
On the other hand, we could use the groups as a rule: post #3178922 is about Wii Fit Trainer (which debuted in "for Nintendo 3DS" and "for Wii U") and Zero Suit Samus (which debuted in "Brawl", not counting the armored Samus). That post then should probably be tagged super_smash_bros._for_nintendo_3ds_and_wii because this game came later. In other words, even though Zero Suit Samus already existed in Brawl, she coulnd't find Wii Fit Trainer there.
Once again, this raises the question of why can't we find all posts of Zero Suit Samus and other super_smash_bros._brawl fighters by using that tag.
Updated by Danielx21