The Past
This takes place several years before MK is born. Focuses on Fang returning to Megapolis to deal with a problem, as well as eventually facing her father after 10 years of silence between each other.
Bitty Fang
for Bitty Fang, it could just be an instance of a bad curse dealt upon her by Yin and Jin. So her and Red are hanging out, and stumble upon the demons, clothes store or what have you, causing a ruckus and interrupting their good time. Fang ain't having it and goes up against the two while Red just sits back because he's not a hero. In the end Fang corners the two, only to get smacked with a curse as Yin and Jin make their escape. Leaving her all widdle an cuuuute <3 And since her dad doesn't know that she's been hanging out with Red, she's desperate to keep their hangout a secret. And attempts to track down Yin and Jin to make them break the curse. Unfortunately the longer she stays that way, the more she begins to forget, until eventually she's left nothing more than a babbling monkey baby.
Insert shenanigans of Red having to chase down baby Fang so she won't DIE and in the end eventually manages to catch up with her after she tumbles off a car with one of his clones who had caught her. Only Nikko (a demon who runs the Arcade) had made it to them first. And offers their aid to them, seeing how amusing it is that they find themselves in such a predicament. Nikko is a lot nicer with kids somehow, and poor Red is just a frustrated mess.
To the point when Fang draws him a picture, he accidentally burns it, and out of frustration her powers start coming out as she turns herself in a baby bird.
Prompting Red to finally approach MKing in order to gather his wit in breaking the curse.
Where they uses his eyes of truth to hunt the twins down, grab the artifact and finally turn Fang back to normal.