What about British Overseas Nationals (BNO), British Overseas Territories Citizen (BOTC), a British Overseas citizen (BOC), a British subject, or a British protected person?

If you are a BNO, BOTC, BOC, British Subject or British protected person, then you are not classed as a British citizen, but Naturalisation is unlikely to be the appropriate British citizenship route. You will have alternative routes to British citizen through registration.