For anyone who has watched the Captain Underpants series, if you have watched the whole of season 2, you would know that there are two separate timelines but we only see one. Melvinborg tries to convince his younger self Melvin to leave further shrunken George and Harold behind in Nanozero, leaving them to die. The timeline that we, the viewers, see is Melvin going against his future self's wishes, saying that when he grows up, he "refuses to be the monster" Melvinborg turns out to be, and then erases him from existence.
How my OC Millie fits into that, take that exact scene again, but Millie is the one to tell Melvinborg no. Melvinborg attempts to hit her, but Melvin steps in front of her, protecting her. He has now seen how bad Melvinborg's treatment towards Millie has been this whole time, and he says he doesn't want to grow up to be the monster Melvinborg is, and especially doesn't want to be the one who hurts Millie.
The canon but unseen timeline where George and Harold do die young, (which I will refer to as the Melvinborg universe) Melvin more than likely gets into Eliteanati Academy and his older self is still just as bad and George and Harold are dead blah blah blah yeah.
How Millie slots into that:
Before leaving Captain Underpants' brain, Melvinborg knew that Millie would try to set George and Harold free, but before she could pick up the size machine, Melvinborg knocked her unconscious, which shocks Melvin, but he shrugs it off for the time being. Upon returning to normal size, Millie grieves the loss of her two best friends and cuts contact with both Melvins. She eventually goes to start a relationship with Erica Wang, and things seem to be going well at first. However, Erica becomes so busy with her career as a senator, and Millie is so busy with her art and music career (they don't take off very well), the two girls get into a huge argument where Millie tells Erica that she doesn't make time for her anymore and that she thought she was the only one who cared for so long. This comes from the fact that Erica was the only one there for Millie when she was possessed by a chunk of Melvin's soul in season 2, which was deteriorating Millie's mental state.
After the girls break up, Millie moves on to Melvin after having cut contact for so long. She partners up with Melvin in the field of science, which she doesn't necessarily enjoy but she's good at it, and the two eventually become a thing. This doesn't last long, due to Melvin being under Melvinborg's influence, their teamwork and bickering sends Millie down a dark path which carries on in later years, eventually leading to her death somewhere between her 20s and 30s.
This time there is no coming back.
To add to Melvinborg's reason for going back in time (for my AU), we know his canon reason for going back in time was to get his younger self into Eliteanati Academy, but in this AU, he had a second reason. Before he went back in time, Millie had somehow died, and he was eager to bring her back, or at least prevent it from happening. Unfortunately, him going back in time was the real cause because no matter what universe he's in with her, Millie will die young.
This doesn't mean that young Melvin is the cause. By the end of season 2, I think it's very clear (to many) that Melvin and Melvinborg are basically two different people because up to that point it's easy to separate their personalities.
I showed my mummy all my hear me outs and I think her mind went blank after she saw Melvinborg from Captain Underpants and Closet from Barbie Life in the Dreamhouse.
BAH of our lord and savior, Melvin(borg) Sneedly? (Either one, it doesn't matter, pref Melvinborg). Thank you, and no rush :3
-@eclipsal-bah-hoard
Yess, absolutely!!! I love Melvin (even if others think he's annoying lmao) I am so sorry for how delayed the other BAHs are, I had so little motivation to do anything but I promise you I'll be done soon, especially now that I get to do Melvinborg!!! Again, I'm really sorry about how late I've been and I take absolutely all responsibility over any (and every) inconvenience it might've caused ,:]