Open discussion: talk about your first week. 
How was the technical setup? 
How did the first meetings go?
Any nice, or not anticipated surprises?

Let's talk about company culture. Pick a value/mission/vision from your company and chat about how you've already experienced this in the first week (even if you haven't it's fine and discuss this)

How much social interaction is there usually work?

What was your first impression of the CEO/Founder?

Is there anything that's unclear/unresolved?

5 discussion topics a new hire can chat about with their onboarding buddy after the first week

5 discussion topics to chat about between new hire & onboarding buddy

Hi, Onboarding Buddy - First Week

More activities

Hi, Onboarding Buddy - First Day

Hi, Onboarding Buddy - First Month

Hi Team - Icebreaker Cards

Onboarding Icebreaker Series - Sports

Onboarding Series - Finding Inspiration

Onboarding Series - Survivor Island

Onboarding Series - How do you like your home

Modern history - which came first?

Pets!

Cheers!