Hey @ma_eau! Welcome to the forums!
As @AreWeGaming said, we unforutately can’t see with no video/screens to work from. However, if your character is facing the wrong way in the viewport, there is a chance that the character was imported with an incorrect forward direction. Would you mind sharing your import settings if you imported the character, as well as provide provide some video examples of what you are experiencing?
Any additional specifics or information you provide may go a long way in solving your problem!