Every Games now has a mascot, usually an invented creature with a backstory. The device arrived late, spread quickly, and became the main way hosts explain themselves to strangers.
The Games needed something to sell
Before mascots, Olympic merchandise consisted mostly of rings, emblems and posters, none of which appeals to children or works well as a toy.
A character solves that directly, since a figure can be manufactured in any material at any size and printed on anything.
Organizers under pressure to fund the Games commercially adopted the idea rapidly once its revenue potential was demonstrated.
American sport had already proved the model
Professional teams in the United States had developed costumed characters as in-stadium performers, with distinct personalities and their own following.
That established both the commercial case and the performance conventions, including the rule that a mascot never speaks and communicates entirely through gesture.
Olympic mascots borrowed the commercial half more than the performance half, existing mainly as an image rather than as a figure in the stands.
The design carries a national argument
Hosts choose animals, folklore figures or invented creatures that assert something about the country, and the choice is scrutinized domestically before it is seen abroad.
A native animal makes a claim about landscape and conservation, while a mythological figure makes one about heritage and continuity.
Abstract designs tend to be chosen when a host wants to project modernity rather than tradition, and they are consistently the least popular with the public.
Committees produce compromised results
Mascot design passes through organizing committees, sponsors and cultural advisers, and each round of consultation removes whatever was distinctive about the original.
The predictable outcome is a creature that offends nobody and interests nobody, which the public greets with mockery.
That mockery is itself now part of the tradition, and it generates coverage, which means the failure mode is not entirely a failure.
The character outlives the Games
Mascots persist in the host city long afterward, appearing on souvenirs, in local branding and in the memory of anyone who was a child that summer.
For many people the mascot is the most durable image of a particular edition, more so than any venue or ceremony.
A commercial device introduced to sell toys has become the element of the Games that hosts use to say who they are.

