I don't know if you've done this before: headcanons on Marty Junior and Marlene?

I'm almost positive I have done some sort of Junior and Marlene headcanon post, but I can't find it, so here are some off the top of my head. Gonna go with the versions of them that I imagine for the timeline that's fixed—where the Rolls Royce accident never happened—and Marty and Jennifer aren't miserable, lol. I think both Junior and Marlene would be more well adjusted in that one (especially Junior!)

• The difference in their personalities is evident to Marty and Jen pretty much from the start, with Marlene being the louder, more demanding of the twins and Junior being a much "easier" baby.

• They're extremely close, and Marlene naturally takes on the role of Junior's protector. Often, Marty and Jen have to remind Marlene to take a step back because she's being a little too much of a mother-hen to her brother, and they want Junior to learn to stand on his own two feet.

• Fixed-timeline Junior is quite different from the version of him in the 2015 we see in the movie. He's been raised in a more stable environment with a father who hasn't been defeated by life, so he's not the wimpy, scared little greasy guy who's easily pushed around. He's more sure of himself, not so easily frazzled, and is every bit as big-hearted as his father.

• Junior is not neurotypical. (How can he be? Look at Marty and George) I don't have a specific diagnosis in mind, but I know a draft of part II made reference to him being in a remedial school (and failing) so there's likely some learning disorder at play. In one of my Doctober chapters that include two-year-old versions of the twins, Clara's excited to learn that Junior has picked up a few new words—meanwhile, Marlene is using full sentences—so I do headcanon him as having been delayed in some areas.

[Side note: in that same scene, Doc tells Marty not to worry about Junior's progress, since Jules didn't start speaking until three-and-a-half, lol]

• Marty loves, loves, loves Marlene so much, but sometimes he thinks that she will be the death of him. Especially when she's young and full of sass and always getting into everything and he's struggling to keep up with her. He and Jen 100% lose Marlene in the mall on more than one occasion, and when they find her, she's just like, *shrug.*

• The twins have a special bond with Doc and Clara. Clara dotes on them but is especially close with Junior while Doc is closer to Marlene. When the kids are little and Marty and Jen feel like they're about to collapse from exhaustion, they dump Junior and Marlene at the Brown home and know they'll be well taken care of.

• As Marlene gets older, she's really into fashion, so she's close with her Aunt Linda. I can see Marlene being popular, but she's the type of popular girl who's liked by everyone. She has attitude, but she's not mean.

• Junior is just...Junior. He loves life and is out there doing his thing. He's the type who has a new hobby or interest every week, and Marty and Jen just have to roll with it. He walks in from school one day and goes, "I'm going to be a famous dancer, I decided" and then a week later says, "I want to learn to build a car" and they're just like, "Oh. Okay."

• I think they'd both try to learn an instrument at some point (likely guitar taught by Marty) but I can't decide if either of them would stick with it long term. Somehow, I don't see them being musicians.

• There's a part of me that wants to say an older Marlene eventually learns about time travel and all the wild stuff Marty went through. Idk how it would happen, though. Maybe she overhears something whispered between her parents in private or maybe she's just very perceptive and notices her father being weird about certain events in his life, so she corners him and is like, "Okay, Dad, spill the beans." Perhaps she's also put together some clues in all her time spent with Doc.

Thats about all I've got for now. Thanks for the ask!