An idealizer is someone who likes to imagine things being the way they want them to be, instead of the way they actually are. This can be like playing make-believe or daydreaming about scenarios where everything is perfect. It's like when you pretend to be a princess or a superhero and imagine a world where everything is just the way you want it. But it's important to remember that while it's fun to imagine, it's also important to learn to accept things the way they are and work to make them better.