How to animate different character with different animations

Hi am new to unity, but the problem is how do i give animations to different character (which are downloaded in mixamo) with different mixamo animations. I saw few videos called retargeting animations.
But none of them helped like some people said make the characters as humanoid in th rig and you will get it but none worked. I am using animator controller with different animations.The last thing that i need is any animations to any character.If that is not possible then any other way to animate

animation remaping needs:

  • humanoid rig, compatible with mecanim
  • configured rig of the avatar
  • animations that are made for this rig (or compatible)

compatibility means that rig contains a certain hierarchy of bones
configurations means that you map each bone to appropriate avatar points
animations should animate bones that are used in avatar