Friendly/Informal:
* "Hey, you!" - A casual way to get someone's attention, similar to how we might call out to a friend.
* "Mortal!" - A slightly condescending, but still friendly, way to address someone. Wizards might see humans as "lesser" beings, but still capable of being allies.
* "My dear/friend/companion/etc." - If the wizard has a close relationship with the human, they might use a more affectionate term.
Formal/Professional:
* "Subject!" - If the wizard is using the human for an experiment or task.
* "Applicant!" - If the human is seeking the wizard's guidance or assistance.
* "Witness!" - If the wizard needs the human to observe something.
Threatening/Condescending:
* "Peasant!" - A derogatory term that emphasizes the wizard's superiority.
* "Foolish mortal!" - Used to emphasize the wizard's perceived power over the human.
* "Worm!" - A truly insulting and demeaning term.
Other possibilities:
* "My apprentice!" - If the human is being trained by the wizard.
* "My chosen one!" - If the wizard believes the human has a special destiny.
It's important to remember that "wizard" is a broad term. There are many different types of wizards in fiction, and their attitudes toward humans can vary greatly. It's best to consider the specific story or world you're thinking of when trying to figure out why a wizard might call a human a certain way.