It's pretty obvious that you are trolling, but for clarity's sake:>The RA kiss wasn't canon
How? Anyway, the kiss in the fifth to last episode only served to canonize the ship, it was heavily implied that Red and Enid had been dating for a while by then. They most likely started dating between "Red Action to the Future" and the Shucksgiving episode, maybe even earlier, so they've spent a good chunk of the series in a relationship. In their last scene in the finale adult Enid and Red Action are still clearly a couple: they are running Carol's dojo together, and the scene ends with Enid kissing Red Action on the cheek.>Those kids in the finale are clearly her and Rad's
According to the creators, they are purposefully ambiguous, though they obviously resemble Radicles and Enid a great deal. Whoever they are, their existence does not invalidate the very canon long-term relationship between Enid and Red Action.>The bi flag was a color error from korea
The bi flag appears at least three times in Enid-related scenes: as a flag in front of RA and Enid's dojo, and at least two times as a sticker on Enid's things. That sticker was designed by Rebecca Sugar for bisexual pride day.
Ian also confirmed that Enid is bi in an AMA a year ago: https://www.reddit.com/r/NintendoSwitch/comments/9tmgdz/hi_im_ian_jonesquartey_creator_of_cartoon/e8xhmrt/
That's not the only time he's talked about it, either, and I'm pretty sure he said on Twitter that this is one of his fav OK KO videos:https://www.youtube.com/watch?v=b3slIBDR7rg
So yeah, no "surprise" lesbians in OK KO, they were pretty obvious and well planned.