Can we just talk about Peridot's incredible character development throughout the series?
We've seen her go from an apathetic, fusion-monster making computer nerd to an adorable monster-imitating, meep morping barnmate. Peridot has learned the value of life on Earth, when to stop a joke, gained metal powers, and has befriended someone she kept prisoner. This is extraordinary character development and change. That's why Peridot is one of my favorite characters of all time.