The latest Final Fantasy 15 Windows Edition update lets players change the appearance of Noctis.
Final Fantasy 15 on PC received a patch today that allows players swap out Noctis and take on the appearance of their Comrades multiplayer avatar. While the English patch notes haven’t been released yet, a translation has been posted over on Reddit. It appears that this is only the physical appearance of your avatar, not their clothing or equipment.
Source: IGN.com Final Fantasy 15 Update Will Let You Change Noctis' Appearance