One thing I love about the show-within-the-show aspect of the Hatchetfield shows is that makes all the songs associated with them diegetic no matter what.
Tgwdlm is entirely diegetic, so that's a given. Deck the Halls of Northville HS ends up being a movie that's playing at that moment. Just For Once perfectly showcases Ruth's feelings at the moment but is also shown to be from the Barbecue Monologues and is actually the main indication of what that show is like and is the only thing to include names of characters
It's just. So fun for me. There's a chance that some Hatchetfield middle schooler was going around singing DtHoNHS before everything with Wiggly went down because they thought it was a cool high school story. Just for Once is a Broadway song within npmd and will be sung at the actual production of the school play, too. It was probably Ruth's favorite song in the show and that's why she picked it to sing
Some Facts and Headcanons about the Blythe kids' appearances
Including how tall I think they are in relation to each other and who they look the most like
Jem
We know that Jem has Anne's red hair but Gilbert's curls as well as his eye color (hazel). He's said to be tall, have Anne's nose, Gilbert's mouth (and probably smile), and "the only one of the family who had ears nice enough to please Susan" (RV)
Pretty much, he's a good mix of Anne and Gilbert
The AoGG wikia also kinda roasts him by adding "Although not as handsome as his brother, Walter, or his best friend, Jerry, Jem grew up to be a good-looking young man" (rip lol, why'd they go with 2 comparisons on his looks in one sentence)
He's also decently tall, though it doesn't specify any comparisons in how tall. I'd say probably a solid 5'10 or 11.
Walter
He's considered the "handsomest of the Ingleside children" with straight black hair, and dark grey eyes.
Given that Anne also has grey eyes (though more green-gray, iirc), and the fact that he doesn't look like any known relative, I feel like there's a chance he looks like either one of Walter or Bertha's siblings (if they had any at any point) or one of their parents, his great-grandparents
As for height, I feel like he was always close in height to Jem growing up, only an inch or two shorter. They end up being roughly the same height by the time they stop growing
Nan
We find out exactly who Nan looks like in the series! During Anne of Ingleside, we find out she looks just like her Grandma Blythe. Consequently, she looks a lot like Gilbert, too -- the most of the daughters to look like him, in fact
She has straight brown hair and brown eyes. Her hair is considered silky, too. Anne appreciates the fact that at least Nan can wear pink out of her daughters
As for height, she's taller than Rilla, but still pretty short. Like, Rilla is barely shorter than her. It's a tough victory but she's not the shortest so ¯\_ (ツ)_/¯
Di
Anne's mini-me! Di has her red hair and green eyes. Her hair is said to have a "swirl to it" so I'm assuming that means she got Gil's curls as well (or at least some waves).
Since she looks so much like Anne, we can likely assume she's also pretty freckled
I like to think she's the tallest of the daughters. Like 5'8 or so, not too much shorter than Jem. While growing up, she was always taller than Nan but not too much -- Nan just stopped growing first
Shirley
Ah, Susan's "little brown boy" aka brown hair, brown eyes, and a darker skin tone than the Blythe kids who got Anne's Very White skin tone. He looks the most like Nan out of his siblings, and is the son that looks the most like Gilbert (just a slight difference in eye color)
We got nothing on his hair texture but I tend to picture him with curly hair too, probably just because of that "pretty close to Gilbert's mini-me" thing I've concluded
Little siblings have a bad habit of being rude and ending up taller than their older siblings. (I say this as an oldest child who has a younger sister that's a good few inches taller than me.) Because of that, I like to think that Shirley ends up the tallest of the Blythe kids. Idk how much taller than Gilbert that would make him, if at all, but he'd be pretty tall, definitely at least 6'2
Rilla
Rilla is a good mix between Gilbert and Anne, just in a different combo than Jem. She has Gilbert's hazel eyes, Anne's freckles, and "ripely, ruddily brown" which is probably exactly what Anne wanted her hair to be when she was younger. So, pretty much, she started auburn/red-haired and turned more brunette as she got older. The red is probably most visible in the summer sun
There also isn't anything about her hair texture, either. I'd say it's either wavy or the type of straight hair that actually does hold heated curls and hairdos better than others
Rilla is the baby and, unfortunately for her, I picture her as the shortest of the family. She's like an inch shorter than Nan. All growing up she probably said stuff like "I'll be taller than both of you!" to the twins and then. it just never happened. Sorry, girl
Fun Facts (aka all this but reworded exclusively)
Jem is the only son with Anne's hair color; he's the only son with Gilbert's eye color
Walter is the only kid with the grey-side of Anne's eyes. He has the darkest hair in the entire family
Nan is the only daughter with brown eyes
Di is the only one with the green-side of Anne's eyes, making her the one with the lightest eyes
Shirley is the only son with brown eyes
Rilla is the only daughter with Gilbert's eyes
None of the children inherited Walter Shirley's blue eyes (probably since the dark-eyed gene is so strong)
None of the children inherited Bertha's blonde hair
And Grandparent Look-Alikes
Jem and Di, because of their red hair, look most like Walter Shirley out of all of their grandparents. Di probably moreso than Jem
We only know John Blythe has brown hair, so it's also possible Nan looks like Grandma Blythe and Shirley looks like John with Gilbert either looking like John or a mix of his parents
Nan is the only grandkid confirmed to look exactly like a grandparent
Walter is an anomaly so who actually knows lol
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Anyway, I don't really have a reason for posting this other than, hopefully, as a helpful guide to others and as a way for me to make sure my hcs for their appearances are written out so I don't mix up my thoughts in the future. Feel free to add any hc's you might have involving the Blythe kids and their appearances!