Hey ! Thanks for your answer.
When the player gets spawned, ASomGameMode::InitNewPlayer fires and causes to set the ID set in the Event SomPlayerController::InitPlayer_Implementation, based on the parameters received while connecting to the server. The same Event Triggers a chain of functions inside the Som_PC - Blueprint:
→ ASomNetworking::CheckSession
→ ASomNetworking::CheckSession_Complete
→ ASomNetworking::CheckSession_Proceed_Implementation
→ ASomNetworking::LoadAppearance
→ ASomNetworking::LoadAppearance_Complete
LoadAppearance_Complete in turn calls the function ASomCharacter::SetAppearance, which sets (among other things) the gender of the character.
I hope that helps. Thanks again for your efforts.