Chillz appears to be a Roblox Brookhaven creator, but I couldn’t verify a specific method for “the hair” from the available public info. The clearest public clue is that Chillz’s Brookhaven videos are standard creator content, while Brookhaven itself has a Hair and Nails shop in-game where players can change hair.

What is most likely

  • If you mean a hairstyle seen on Chillz’s avatar, it was probably made the same way most Roblox looks are made: by combining a hair accessory with the avatar editor, not by anything special inside Brookhaven.
  • If you mean a hair style used in a Brookhaven video, it may just be an avatar item worn by Chillz during filming.

Brookhaven context

Brookhaven has a Hair and Nails location in the map, and that is the in-game place tied to hair changes.

That does not indicate Chillz invented a custom hair system; it only shows where players can access hair-related features in Brookhaven.

Best read on the phrase

“how did chillz make the hair in brookhaven” sounds like a viewer asking about a specific look from a video or thumbnail. Based on the public pages I found, there is no verified post explaining a custom hair-making process from Chillz.

TL;DR

Most likely, Chillz did not “make” the hair in Brookhaven itself; it was probably a Roblox avatar hair item or a Brookhaven salon-style change shown in a video.