What are the 4 main characters of the magician's nephew and what is its personalaty?

Diggory Kirke is the young protagonist. He is the curious scientist whose desire to know all about everything sometimes gets him into trouble. He is from a conflicted family: his mother is dying, and he has a very unpleasant uncle.

Polly Plummer is his sidekick. She is an "ordinary" girl with common sense and a people-oriented approach.

Andrew Kirke is Diggory's uncle, the magician of the title. He is also a curious scientist, and he is willing to sacrifice any person or principle for the sake of discovering what he wants to know. In fact he is not as clever or powerful as he thinks. He has no understanding of what the universe is really like, either morally or magically, and he does not recognise that the witch is only using him.

Jadis is a powerful witch from another world. She is evil. She destroyed her own planet rather than cease to be its Queen, and she is now on the search for a new planet to dominate.

Aslan is of course the hero of the whole Narnia series. He is a Christ-figure. In The Magician's Nephew, he is seen mainly in his creative aspect, but he also teaches Polly and Diggory some important lessons about the nature of evil.