It looks like Good12 in Roblox/Forsaken is a fan-made or community-created skin tied to the JX1DX1 character, not an official Roblox term. One post on X says it was “originally planned to be JX1DX1’s replacement skin in Forsaken,” and a YouTube clip also describes Good12 as a “scrapped” skin that can still appear in fan content.

Where it seems to come from

  • The name appears to originate from the Forsaken Roblox fan/community space rather than from Roblox itself.
  • “Good12” is presented as a replacement skin concept for JX1DX1, which suggests it started as a design or lore idea in that community.
  • The limited public references I found point more to fan discussion and edits than to an official developer announcement.

What that means

  • If you saw “Good12 arg,” the “ARG” part likely refers to a Roblox community alternate-reality game or lore project rather than a built-in Roblox feature.
  • So the most likely origin is a community nickname/character concept that spread through fan posts, edits, and ARG-style discussion.

Practical read

  • In plain terms: Good12 came from the Roblox fan scene, especially around Forsaken/JX1DX1 content , and it seems to have started as a scrapped or replacement skin idea.
  • It does not look like something officially documented by Roblox itself from the sources surfaced here.

TL;DR: Good12 appears to be a fan/community-created Forsaken skin concept tied to JX1DX1, not an official Roblox feature.