The contributors

Kamokamen, original/main character designer (Twitter @ sangsilnoh)

Oobari Masami, director (Twitter @ G1_BARI)

Ura Ryuuta, chief animation director (Twitter @ matatabeat)

The origins

"happy new episode release" bonus arts by the main character designer

and their two Yotsuba&! joke tweets:

Isami works at a flower shop called Brave Flower

Smith is the single father of the "mysterious girl" Lulu who is in kindergarten

This spiraled into a whole AU that has Actual Lore because the staff kept adding to it.

My main sources were 2 different tweet compilations made by Japanese fans and the very broken Twitter search. I got into the fandom when Episode 9 aired (before that I was just watching the show weekly and nothing else) so backsourcing all of this was not easy, and unfortunately I can’t guarantee this post has every relevant tweet. For example I found nothing about Smith’s job. It might exist, it might not, who knows. But the staff was very clear that they just wanted everyone to have fun coming up with ideas when they were tweeting about Bravern-the-character.

Isami & Bravern

- Isami and Bravern drive a motorcycle with a sidecar (ART!) called Brave Thunder

- according to the director Bravern wears a helmet

- Bravern exists in that miniature form which was designed by the director, completely unexplained (first appearance of "easy-to-draw Bravern-kun" | official plushie version which he brought to the 3rd talkshow | non-flowershop AU maid uniform update! also designed by him | "bunny day" update)

(T/N: this is not actual canon, but in the Animedia (May issue) interview’s Q&A section the director said Isami has the impression of someone who has a much older brother who passed away when he was young. JP fandom said nope this is the happy AU so he’s alive)

Smith & Lulu

- Smith and Lulu drive a "granny bike" called Spar Kaiser

- Lulu's seat is a child bike seat dubbed "co-pilot seat"

(T/N: answering a fan’s question, the character designer who designed Smith’s weird shirts once tweeted he’s probably using a translator app to scan the text on them.)

Other characters

- as far as I know there’s no "official" flowershop AU version of Superbia

- some time ago the director made a miniature design for him as well, but people usually draw Superbia in a humanoid form in this AU which was designed by the character designer

(T/N: not flowershop AU related, but Superbia speaks in Hiroshima dialect.)

- Miyu has a moped (a modified old Honda Super Cub) and she rides around town with Hibiki to get McDonald’s

(T/N: also not flowershop AU related, but Hibiki considers Isami a younger brother, according to the 3rd talkshow reports.)

- Satake was Isami's homeroom teacher and he was the one who taught him how to properly ride a motorcycle

- it was due to Satake’s influence that Isami chose an American-style Japanese bike which he bought secondhand for cheap for the fun of repairing and customizing it

(T/N: the tweet linked above is from March, but at the 3rd staff talkshow we learned that Satake’s bike in canon is a Honda CBR250RR. At the 2nd talkshow the staff said he gives off the impression of being a good cook, and the director shared he must be single because of the bike & red jacket combo.)

ADD ALT TEXT if you share this on other sites as screenshots. I genuinely can't be assed to care about credit, but I care a lot about accessibility.