It's in the
community update! Let me find the link.
EDIT
Here you go, It says:
Unlike Baldur’s Gate 3’s other playable protagonists, the Dark Urge is a fully customisable character. Should you prefer that this darkness take the shape of a doe-eyed gnome instead, or think true evil is a half-orc armed with a bongo, the choice is yours: from your class and species, to your gender and overall appearance, and even your name.
Thank you for shedding (ahem) light on this query...It gladdens my heart greatly to read this.
Good luck and Godspeed Larian!