Reviewing Labcoat

“I don’t want you to go to CHS,” Sugarcoat clarified. She pushed herself from the door frame but stayed standing in the doorway itself, blocking any exit. Her face dropped.

I interpret this as Sugarcoat representing Twilight Sparkle's subconscious and her conscience.

“B-but why? There’s so much for me there, and so little left for me here. Those girls hardly knew me but gladly welcomed me and shared advice and— and they didn’t even seem phased that I turned into a,” Twilight looked down as tears stung the corners of her eyes, “a demon.”

This version of Twilight seems so full of guilt, and can't get over the fact that she had transformed into a horrifying demon. I would understand too, if something like this happened to somebody, and they became someone they didn't want to be.

Twilight shakes her head. “I just don’t understand. You’ve said some unkind things to me, how I suck at archery or public speaking or joining in with everyone to make me release that magic—”

Interesting here how Twilight starts getting flustered as soon as Sugarcoat grabs her arm, when she also mentions how Sugarcoat has bullied her in the past for her hobbies and interests.

Twilight didn’t shy away from Sugarcoat’s hands and nodded slowly; her eyes were transfixed on Sugar’s and how her silvery-white and blue streaked hair obscured anything else but the insistent, intense orchid eyes piercing into her own.

The way Sugarcoat's eyes here get described as opposed to how Twilight feels contrasts so sharply. Her eye colour gets described as "silvery-white" and her hair as "blue streaked" which do seem beautiful when described, yet her eyes also get described as being "intense" and "orchid" while also "piercing into Twilight's eyes".