Anime, gaming, pets, travel and home improvement rank in the top 20 interests of the nation, according to eBay's search engine data.
The nationwide analysis of search engine data and more than 16 million social media posts revealed a diverse range of passions "that give Aussies their mojo", eBay said.
The top 20 is wall-to-wall sports. AFL, NRL and soccer top the list and are followed by UFC, American football, cricket and tennis.
Niche sports that ranked in the top 100 list include Formula 1 at number 12, rock-climbing at number 27 and badminton which is ranked at number 32. Cheerleading, ice-skating and scuba-diving also made the top 100.
Fish and aquariums ranked as Australia's 47th favourite interest with most enthusiasts aged between 18 and 24 years. More than 2,000 social media posts found Afro-beats music and tech-news were common sub-interests for fish fanatics.
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Australians invest significant time and money into a diverse range of hobbies, passions and interests, the data found.
About 93 per cent said they dedicated at least one hour per week to their passion.
More than 82 per cent said they spent up to $4,000 per year on their hobby.
The online marketplace revealed some of the most ostentatious purchases made on their Australian site included a signed Richmond Tigers AFL jersey worn by Bachar Houli which sold for $13,127 and a Michael Jordan autographed 1st Championship 1991 commemorative card that sold for more than $100,000.
Aussie scarf sales skyrocketed by 2,650 per cent as the Matildas prepared for their showdown against France in the FIFA World Cup, eBay said.