1.When a non-canon-anime/comic/manga/movie/book/webcomic/etc. fandom appears like Planetary Moe. No one knows the fandom exists until one of the larger fandoms know about it. Thats when the fandom start talking about the fandom, and everyone is confused at what they are talking about.
2. Hetalia is one of the fandoms that know about the other little unknown fandoms. For example he knows about Planetary Moe.
3. Hetalia considers PM his little sibling since their characters are really alike in personality. And that PM is the ‘human forms’ of outer space things and Hetalia the 'human forms’ of countries
PM (Short for Planetary Moe)