"Moe" is a slang term that people sometimes use to describe a fictional character they find very cute or attractive. Think of the cutest puppy you've ever seen or the coolest superhero you've ever heard of. When people call these characters "moe," it means they really like them and think they're super cute or cool. It's kind of like saying "awww" or "oh my goodness" when you see something really adorable or amazing. So, if someone says a character is "moe", that means they like them a lot and think they are really cute or cool!