THIS CONTENT contains SPOILER! Read at your own risk.  
“Did you know? When Princess Twilight Sparkle traveled to other world, she met the other girls who look exactly like her friends back at Equestria, even her counterpart-self.”  
““Princess Twilight: Make that the second strangest…
 
“But… How about Sunset Shimmer?”
 
Applejack: “Sunset, you still have this?” holds her geode  
Sunset Shimmer: “Still here.” shows her geode  
Applejack: “Thank goodness, it’s you.”  
Sunset Shimmer: “Why? What’s going on?”  
Human Twilight: “Well. It’s kinda more awkward.”  
Rarity: “It was a girl who came here and look exactly just like you… but more different…”  
Sunset Shimmer: “Wait what?”
 
I can’t take it anyone… After I read the book version of “Forgotten Friendship”, I’m still thinking about these stuff:
 
We know already about there are many counterparts from Equestria to Modern Human World. Some of them look exactly just like from Equestria, but act different in Human World(In Equestria, Filthy Rich seems very nice, but in Human world, he’s greedy/selfish.) Most of you were expecting for villains, but only to see some of them are actually Plush Toys or video game characters in the Human World(Tirek’s Revenge video game in the short, “Fine Line”).
 
It’s bit strange, we only see the first Humane 5 were only ones look the same and act the same as the 5 ponies back at Equestria, except for Twilight’s counterpart.  
She has her hair in ponytail and more nerdy look with glasses. Unlike Pony Twilight, her hair is down and unbraided, and her clothes look like an average school girl but, without glasses.
 
Let’s think about Human Sunset. You know, Sunset Shimmer is only a Pony Character who doesn’t show her counterpart-self like Twilight’s.  
One of Future episode of Digital series, Sunset Shimmer seems to have her own Youtube game channel, as “Shimmer Code”(SPOILER).  
I just imagine while watching this, what if one of the watchers will just say when pointing to this video, “Sunset, is that you playing video game with this little girl?”  
Sorry, if my grammar is wrong…
 
No one/pony in the streets mentioned about Sunset Shimmer’s “Twin Sister”, when they only saw Pony Sunset walking with her 6 friends.
 
When I watched the afternoon-drama show tells about a woman who seeks vengeance after she suffers from the loss of her loving parents, it’s where I get an idea for Sunset Shimmer’s Counterpart. This counterpart seems to be sounds different, and she adopt/change her own name as “Sandra Shim”.(Think about Tempest Shadow in MLP the Movie, she changed her name over her original one.)  
Unlike Pony Sunset’s old bully-self, this one is not mean at all but stubborn, very strong and smart when she takes risks. Any one of you thought she’s from different school other than Canterlot High and Crystal Prep, but no one knows yet.  
In her back story is very intense just like what I watched the afternoon-drama. She is adopted by one old Man who home-studied and trained her hard to be a strong person. And of course, The old guy seems to be a loving man towards his adopted Sandra.  
Her dream job as a Attorney/Detective is to bring the truths from the cause and never judge people directly. Her knowledge is very powerful to solve the cases(Phoenix Wright/Sherlock Holmes, anyone?).  
Sandra seems to be overprotective towards her “younger sibling” and despises any magic found in the Human World, until she found Pony Sunset and other 6 friends.
 
Like Twilight’s different counterpart design, I made her as a rich girl but, formal working girl.  
Her hair design is much different than Sunset’s, it’s a short-length hair and I used the original hair color when Sunset was a baddie.  
Also, some make-up, in order to make her look more mature. The Humane 6 mistaken the necklace she’s wearing as Sunset’s magic geode, but it’s actually her locket contains her family-picture.
 
Well… I think my idea is less G-rated thing… Because of Action and Drama-intense.  
I hope MLPEG creators should make Sunset Shimmer’s Counterpart.  
Forget about Fun-stuff from future episodes of Digital Series, I want Human Sunset Shimmer NOW!
 
I hope you like it!
 
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Sunset Shimmer - My Little Pony Equestria Girls (c) Hasbro