Here are some examples:

Discuss general topics such as cooking, travel, and anime.

Proofreading

Presentation rehearsal

Interview practice

Preparation for the academic research

Career choices:

What are you passionate about doing?

What are your career aspirations?

Where do you think you can be successful?

Do you have a part-time job? What skills and qualities do you think you can gain from this job?  

Is there anything are you happy with about your job?

Which person do you think has a more interesting professional life?

You may also want to talk about your average day at work, any challenges, qualities, and skills required in your job, etc.

Questions on academic life

What subjects do you like best/least? And why?

What kind of research topics would you like to study more?