I definitely need some advice, 'cause all my character asset (which are pretty old but I still wish to use it) are with Legacy animation, so I need to adapt in someway PlayerMovement, with Animation instead Animator…
To do it I guess, I’ll need to put hands also on ThirdPersonCharacter 'cause require an Animator component too.
So to made work PlayerMovement, I need to change ThirdPersonCharacter… and at this point I’m lost.
Any good soul could help me?
[Edit]
I’ve read that Animations component is deprecated, so I guess I need to find a way to made my chracters to work on Animator…
Ok then, I guess, I should need to study how this is works 
[Edit2]
Importing Humanoids Animations saved my life 