I really want to see some development to Diamond Tiara and Silver Spoon (who I call Silly). I know a lot of us, including me, don't like DT because she's pointlessly cruel and has very little character development beyond being the stock bully character. I was thinking of story ideas for an episode where DT and Silly fall out and break up, giving them both a chance to learn a little more about friendship, then I saw a video on YouTube just yesterday about these two that talked about the phrase 'silver spoon' meaning that a person was born into wealth so never had to worry about working hard and had an easy life, but isn't necessarily a bad person. That suggests Silly has always just gone along with what other ponies have done and latched onto DT when she started school because she seemed to know what she was doing. This gave me the last thing I needed for my idea
DT pushes some kind of joke or insult or mean plan too far and Silly (hesitantly) calls her out on it. DT tells her something along the lines of "If you don't like it, then why do you do it?", and since Silly has always just agreed with her and stuck by her, she assumes she'll just falter and go back to normal, but she actually stands up for herself and they break up. Silly is lost without somepony to follow, and DT is lost without somepony following her. DT tries to convince other foals to be her friends but they want nothing to do with her, while Silly goes to the CMC to apologise and befriend them. I'm still trying to figure out an ending...
... That was kinda long, sorry