Thanos is a fictional character and a supervillain appearing in American comic books published by Marvel Comics. He is the main antagonist in the 2018 Marvel Cinematic Universe film Avengers: Infinity War and the 2019 film Avengers: Endgame. The 3D model of Thanos would likely be a computer-generated representation of the character, used for visual effects in film or video games. It would likely include detailed textures, rigging for animation, and a realistic appearance to match the character as he appears in the Marvel Cinematic Universe.