Posted under General
Flying Fairy is a subtitle. Under standard punctuation rules, these are broken up by colons. Even JA wikipedia says Bravely Default: Flying Fairy.
Either way we shouldn't alias bravely default to FF unless we know the connection between this, Praying Brage and any other spinoffs they have set up.
Nobody bothered with punctuation early on in danbooru, correct. In the beginning tags didn't even have underscores, they were just long blobs finalfantasyviiadventchildren would be the tag if we hadn't started putting in underscores. The older the tag/lazier the person to establish the tag, the less likely it is to have punctuation.