Testimonials - Positive Experiences
An idea that I've used in the past with organizations I've worked with is testimonials soliciting positive experiences. I think it would build a strong culture of positivity if you asked some of your creators to share their favorite moments with their audiences - or a time that they we really satisfied with the community they've build on Twitch.
It would help promote Twitch as an employer and it would humanize the "streamer" to the community.
I agree! These testimonials can also serve as more examples for how to engage your audience :)