To make the biggest avatar in Roblox, you can use the built-in character customization options or use the Roblox Studio to create a custom character model. Here are the steps to make the biggest avatar using the Roblox Studio:
- Open Roblox Studio and create a new game or open an existing one.
- In the Explorer window, select the character model you want to edit.
- Use the Scale tool to increase the size of the entire character model
- You can also use the Move tool to adjust the position of the body parts to fit the new size
- Test the character in-game to see if the avatar looks as desired.
Note that there are some limits in Roblox for avatars size, such as the maximum size for a character model is around 50 studs, also the physics engine and collision detection in roblox may not work properly with large avatars, so you may have to test and adjust the size as you see fit.