Pottermore: Patronus

https://my.pottermore.com/patronus

The website is a simple click interaction where you will be able to create your own creature depending on your choice. You can read more about the creature you have created here: https://my.pottermore.com/user-profile/patronus. Despite not having an explicit storyline, the user can interact with the creature.

It is an interesting approach to allow the user to interact with a mythical creature based on their choices chosen. It can be a way of interactive narrative.

P.S: If you are a Harry Potter fan, you may love this!