If you add a new contact to your phone, can you do anything to not show up in the other person's whatsapp contact list at all?
(If you block them on whatsapp you'll show up nevertheless just without profile picture, status and last seen.)
Most Helpful Girl
"Even when you block a contact, they'll cotinue to have you in their contact list because they presumably still have your number in their phone book. The only way you won't show up is if the other person doesn't have your phone number saved in their phone."