Starlight has been researching magic on Earth for a long time. The people in her village believed her to be a madwoman, until discovering the magic of Equestria by accident, when the filtered magic hits some pieces of quartz and upon having contact with one of them, she acquires a powerful magic; more powerful than the Rainbooms possess. She along with some of her friends (without them having any idea) thinks to use this magic to bring Sunset and her friends to their knees; since it considers them unworthy of magic; their mission: to take their talents from them and use them for their own benefits.
Human Glimmy: Well well well, hello there.
Me: sees Human Starlight walking up to me cutely Hey Starlight.
Human Glimmy: How do you know my name?
Me: knowing that this isn’t the Starlight I knew well Because I’ve met your pony counterpart in Equestria.
Human Glimmy: Is this “other Starlight” just like me?
Me: If you mean by taking cutie marks from other ponies, then I would say use to be. She’s much nicer now, unlike you!
Human Glimmy: trying to sound innocent Me? Mean? Evil? What utter nonsense!
Me: No, Human Glimmy! I know how you are here right now! You clearly asked if this other Starlight was just like you, and that was a huge giveaway to your true personality! Once Sunset and pony you find out, you better give up, because you’ll be dealing with TWO former villains, if you don’t change!
Human Glimmy: grabs me by my shirt and gets my nose pushing against hers Listen her, punk! I will get those abilities for myself, and if you get in my way again, you better get ready to say goodbye to your life!
Me: prepares to slap him Don’t make me slap a girl! Both you and I will regret it!
Human Glimmy: You wouldn’t dare!
Me: Let go of me then, if you don’t wanna be slapped!
Human Glimmy: reluctantly let’s go of me Fine, but don’t think I’ll give up easily.
Me: showing a tiny bit of passion Although, I will admit you are cute. That outfit suits you really well. It covers your evil side quite well.
Human Glimmy: Ah shut ya gob, before I punch it out of existence!
Me: half-heartedly Just saying what I was thinking of your looks, that’s all.
Human Glimmy: I’d book it if I were you right now. I’m about to change my mind here in the next 5 seconds if you don’t book it.
Me: Alright, alright, I’m going! walks off and says to self Sheesh, Glad pony Starlight isn’t like that anymore.