Place this clip right after the newcomer's entrance shot, before any reaction from the group. Follow it with a bruh sound effect to underline the scepticism, or precede it with the oh my god meme sound when the entrance needs a bigger build.
About this sound
This seven-second voice clip is a blunt, bewildered question asking who Gigga is, delivered in a flat, disbelieving tone that rises at the end. It feels sceptical and funny, like the reaction to a stranger acting like the main character, and the confusion registers instantly even with no visual to explain it.