Well, Wiz is really unique in the Konosuba light novel. She is extremely intelligent. Her knowledge about magic and the various creatures in the world is vast. This often comes in handy for the main characters. Also, she has a very kind heart for a lich. She runs a magic item shop and is always fair in her dealings, which is quite different from the typical portrayal of liches in other fantasies.
In 'The Wiz', the place is Oz, which is a fantastical land full of strange creatures and magical places. The time is not clearly defined in a historical or modern sense. It's more about the journey through this magical land where different events occur without being tied to a particular time like our normal world. For example, the characters experience various adventures and challenges in Oz that could happen at any time within this enchanted realm.