In a Japanese shop selling pocket-money trinkets, there is a rack of toys, stickers and keyrings based on a global crew of AI-generated characters that almost every child knows about -- and very few adults.

A walking shark in oversized sneakers, an orange with muscular arms and a twirling "Ballerina Cappuccina" with a mug for a head are among the strange stars of the online phenomenon called Italian Brainrot.

"At first it's not funny at all, but it kind of grows on you," 16-year-old Yoshi Yamanaka-Nebesney from New York told AFP.

"You might use it to annoy someone and find that funny."

The name nods to the stupefying effect of scrolling through mindless social media posts, especially over-the-top images created with artificial intelligence tools.

Shouty, crude and often nonsensical It

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