Here is a list of the components permitted on avatars. Any component not on this list will be removed at runtime, and may prevent upload.

Custom scripts/components are not permitted on avatars, and will be removed at upload and runtime.

VRChat

• VRC_AvatarDescriptor
• VRC_IKFollower
• PipelineManager

Unity

• Transform
• Animator
• SkinnedMeshRenderer
• MeshFilter
• MeshRenderer
• Animation
• ParticleSystem
• ParticleSystemRenderer
• ParticleRenderer
• ParticleAnimator
• EllipsoidParticleEmitter
• MeshParticleEmitter
• TrailRenderer
• Cloth
• Light
• Collider
• Rigidbody
• Joint
• Camera*
• FlareLayer
• GUILayer
• AudioSource
• AimConstraint
• LookAtConstraint
• ParentConstraint
• PositionConstraint
• RotationConstraint
• ScaleConstraint

DynamicBone

• DynamicBone
• DynamicBoneCollider

Root Motion

• VRIK**
• FullBodyBipedIK**

* Camera is only activated locally, or for Friends of the user wearing the avatar.
** Using this script on a humanoid avatar will break it.