You won't find official SEGA models on GameJolt. SEGA does not upload proprietary files there. Instead, you will find community-ripped or fan-made models.
GameJolt has historically been the epicenter of the Sonic fangaming community. Games like Sonic Before the Sequel, Sonic After the Sequel, and Sonic Robo Blast 2 have millions of views.
How to extract sonic.fbx from a GameJolt game: sonic.fbx download gamejolt
Warning: Not all games leave their source models exposed. Many developers package everything into .dat or .assets files that require specialized decompilers like Unity Assets Bundle Extractor or Ninja Ripper.
A direct query for "sonic.fbx" on the GameJolt platform yields numerous results, broadly categorized as follows: You won't find official SEGA models on GameJolt
If you run the search today, you will likely find:
Warning: Avoid "exe" files. A genuine Sonic.fbx download is a compressed folder (.zip or .rar) containing a .fbx file, texture PNGs, and a text README. If it asks you to run an installer, close the tab immediately. Warning: Not all games leave their source models exposed
This is the most critical part of the "sonic.fbx download gamejolt" search.
SEGA is famously lenient towards fan games, but they have strict rules:
The Golden Rule: Using this download for learning (portfolio, school project, free fangame) is generally accepted. Using it for a commercial product is copyright infringement and will get you a Cease & Desist letter from SEGA of America’s legal team.