Alright guys, I can already see the handwriting on the wall, so I am revoking the option of keeping your Servant's identity and Noble Phantasms secret. It presents several problems of its own, especially with planning related to alliances. Several NPC Characters however will remain secret, Ruler being the primary example.
Speaking of, is Ruler's picture supposed to be indicative in any way of who he is? I want to check before I give into the temptation to reverse image search.