Riddles for Improv Troupes and Comedy Nights

I say yes, and build worlds from thin air. What am I?

I live in the suggestion shouted from the back row. What am I?

I hold props, wigs, and last-minute inspiration. What am I?

I time scenes with lights and buzzers. Who am I?

I respond faster than a punchline needs a setup. What am I?

I keep score in competitive comedy bouts. What am I?

I freeze performers mid-scene for tag-team laughs. What am I?

I whisper character quirks through mystery envelopes. What am I?

I set up yes-and exercises on index cards. What am I?

I create sound effects with my voice and a loop pedal. Who am I?

I applaud with jazz hands when scenes slay. What am I?

I update social feeds with show highlights. Who am I?

I turn awkward pauses into comedic timing. What am I?

I scribble suggestions in a hat before the show. What am I?

I remind performers that failing big means laughing louder. What am I?