Dandelion is Cogs' firstborn daughter, and a joy to him and his wife. As a changeling though, Cogs had no experience with raising pony foals, so when a crisis arises, he often has to wing it. Sometimes the solutions are more creative than others
Twilight may have become a Princess, but she still has a lot to learn. Now that she's around the castle, though, she has more than just Celestia to teach her.
Trixie's line of work is dangerous. But she's a careful showpony, and that's why she's only died a few dozen times in her career. She thinks this is normal.
Fluttershy, with the help of Twilight, plans to tell her friends that she's a changeling, but when Fluttershy and Twilight are teleported to a mysterious forest, it seems the two won't be able to find their way home.