Your description is already very good and friendly, but here are some small improvements to make it clearer and grammatically correct:
Original:
Learning should be a pleasure and never a chore! Having a friendly learning companion can make a big difference. That’s how we’ve come up with Robby, a talking robot that plays sounds, asks questions and shares fun facts.
Improved:
Learning should be a pleasure and never a chore! Having a friendly learning companion can make a big difference. That’s why we’ve come up with Robby, a talking robot that plays sounds, asks questions, and shares fun facts.
Explanation:
- 'That’s how' is better changed to 'That’s why' because it explains the reason for creating Robby.
- In a list ("plays sounds, asks questions, and shares fun facts"), it’s clearer to add a comma before 'and' – this is called the Oxford comma.
If you want, I can help rewrite it to be even more fun and simple for an 8-year-old!