Okay kiddo, have you ever heard of creatures that are half-human and half-something else? These are called mythic humanoids, and they are creatures from legends and stories that people have been telling for a long time.
One of the most famous mythic humanoids is the mermaid. Do you know what a mermaid is? It's a creature that has the body of a fish and the top half is a human. Some people believe that they really exist in the ocean, but we don't have any proof of that yet.
Another famous mythic humanoid is the centaur. A centaur is a creature from Greek mythology that has the body of a horse, but the top half is a human. They are usually pretty strong and tough, and they were often used in stories to help heroes on their quests.
There are many other mythic humanoids too, like werewolves, which are half-human and half-wolf, and minotaurs, which are half-human and half-bull. People have been telling stories about these creatures for centuries, and they are still popular today in books, movies, and TV shows.
So mythic humanoids are just creatures from stories that people have been telling for a long time. They are usually part human and part something else, and they can be pretty cool and interesting to learn about!