Hi, as a moderator I can ban an account but not delete one. I will send a request that this account is deleted.

In the meantime, in case the info is useful to anyone else, yes it is possible to contact Larian Support via their support website (https://larian.com/support/baldur-s-gate-3#modal) to request an account deletion.

"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"