The best way of finding out the answer to this question is of course to read it, however, I will summarise the main characters for you. There are two families that are referred to in the story: the Burnells and the Kelveys. As befitting the message of the story which is based on social class and the way that humanity always tends to exclude and oppress others, the Burnells are very well-to-do and the Kelveys are shunned by society. The Burnell sisters - Isabel, Lottie and Kezia feature heavily in the story as the owners of the Doll's House, and the Kelvey sisters, Else and Lil, feature as the shunned minority who are not allowed to even see the Doll's House until Kezia lets the Kelvey's in to see the Doll's House. Unfortunately, then Kezia's Aunt Beryl throws the Kelveys out, reinforcing class distinctions and ruining Kezia's innocent gesture of class equality.
Clearly the most interesting characters in my mind are Else and Kezia - Kezia for her decision to show the House to the Kelveys, and Else in her final comment regarding the lamp, which you would do well to analyse further and consider what its symbolic importance might be.