What users are we talking about

Awesome users, like maybe they have this awesome hat with a huge brim or they are a ninja or something.

and what customizations will they be able to do

Add bunnies to the front page or make it so you can learn to be a pirate by using the app or order cookies to your doorstep!

and how do those customizations make the app better for those users?

Because it would be totally awesome to learn how to be a pirate and bunnies are cute and cookies are delicious and WHAT IF YOU COULD HAVE ALL OF THEM AT THE SAME TIME????