Okay, so this post will ruin the season 8 finale if anyone still hasn't seen it (I only saw it yesterday). It's my favourite episode(s) of the new seasons because the villian, Cozy Glow, is the cutest sociopath ever. She uses a sort of passive aggression (but very subtle) and a little sarcasm to manipulate other ponies in a charismatic manner. She uses this charisma and master planning skills to drain all the magic from Equestria and almost put it into the void, along with some protagonists. It ends with her plan failing, due to magic from the Tree of Harmony (I think) and a lack of security, and she, a little filly, gets imprisoned in none other than Tartarus.
Despite this, I have some pointless complaints: she has a rook for a cutie-mark, because she plays ponies like chess, but I think it should be a queen and she states that she will become the Empress of Friendship, but I think she should want to be the Queen of Equestria because of what I think her mark should be. That's just my opinion. It could be a king (which is also fitting) but it looks more like a rook. So that's my first complaint; the second is her lack of a third step in her plan. 1. Drain Equestria of magic to eliminate the main threats (while she imprisons the Mane 6). 2. Gain control of the school of friendship by winning over the students and become the permanent principal. 3. Become the Empress of Friendship and gain control of all of Equestria, somehow.
That's what I don't get. She needs another step, she can't just immediately checkmate Equestria just because she becomes a principal. Her next step should be starting a village like Starlight, then something else, I dunno. Maybe she just overlooked it, which doesn't seem like her, but maybe she's just a filly who got overexcited. Just a thought. What do you guys think?