Rigging

Create joints for the character.

Test if those joints works well.

Create controller for each joint.

Test if those controllers works well.

Use Paint skin weight tool to ensure that the characters will not be squeezed and deformed during the animation editing process.

The character is an astronaut, since the spacesuit is relatively bulky, I decided to minimize the squeezing of the character, especially with the helmet.

I also tried IK handle on the character. However, it didn't work well as it will always crash the character.