Creating a character
There are many ways to create a character that is three dimensional. Description of how they look is just the start. Dialogue is a great tool. How someone speaks gives a lot away about the person they are. Are they straight to the point or prevaricating? What is their vacabulary? Do they use certain catch phrases? How do your other characters see them? Often, different people will each see a person in a quite different light. What are their habits? Are they slovenly or super tidy to name just two. It's the old business of showing us rather than telling us about them.