Big Brother is... Sorry, not that Oceania. Oceania is Australia, New Zealand, and the Pacific Islands. It's a political continent rather than a geographic one, because it's not a huge landmass but a collection of islands and atolls. On the other hand, Australia is considered a continent in its own right. To confuse the terminology further, Oceania is often considered part the Asian region (but not the continent). The islands are divided in three zones: Melanesia being the islands north and northwest of Australia (Papua New Guinea, Fiji, Vanuatu, Solomon Islands, New Caledonia, Australia's Norfolk Island, etc.); Micronesia, the micro-islands north of Melanesia (Federal States of Micronesia, Palau, Kiribati, Marshall Islands, Guam, Northern Mariana Islands, Wake Island, etc.) and Polynesia, with a lot of islands (New Zealand, Tonga, Tuvalu, Samoa, Cook Islands, Easter Island, Hawaii, French Polynesia, etc.). You might also hear the term Australasia, this being Australia, New Zealand, New Guinea (the whole island) and some neighbor islands, including some of Indonesia. Sometimes Australasia is used the same way as 'trans-Tasman', to refer to Australia and New Zealand alone. Regarding tropes, there are few of them here. Why? The islands have achieved independence only in the 70's and 80's. With the exception of the biggest three,note every single country here has less than a million people, and most have less than 200,000. Do not confuse with Oceania from 1984, which comprises mutually exclusive territories.
Oceania contains many small territories of Western powers, such as: