The second generation of My Little Pony was a huge bomb in most countries and is widely considered the Dork Age by fans. It lasted only one year in all countries except several European ones, where it lasted six years. Naturally, most of the generation's fans come from Europe.
IKEA's "Lufsig" wolf plushies experienced a huge surge of popularity in Hong Kong and China after a protester threw one at Hong Kong's leader CY Leung, who had been called "the wolf" by critics who think he is cunning, and as a pun off his name in Chinese). That and the rather unfortunate name Ikea's Chinese website gave the toy; which could be used to refer to a part of a Mother's anatomy, and even worse, a phrase essentially meaning "Throw Lufsig" that could be read as "fuck your mother".
Pogs in Mexico, known there as "Tazos", were introduced in 1993 starting out with a Looney Tunes theme, and lasted all the way up to 1996; during these years, you could see crowds of elementary school kids striving every day to hoard more Tazos than their fellows, and nothing imposed more respect on the playground than having a huge bag full of Tazos. They have since been reintroduced regularly every couple years with predominantly good success.
My Scene dolls are still being sold in Canada and Mexico despite being removed from store shelves in the US in 2010.
BIONICLE and some other LEGO action figures have historically been successful the world over. But around the early-to-mid 2010s, most of the popularity of such lines seemed to come from Europe and Russia.:
European publishing company Ameet released exclusive Bionicle magazines and books in several countries while the American book series from Scholastic were failing. Two expansive guidebooks also came out, both of much higher quality than most of Scholastic's output. And the last Bionicle novel was only published in Poland, while the rest of the world had to settle for getting the chapters online. This is especially notable since the franchise's books barely reached Europe for the most part.
BIONICLE (2015) got exclusive polybag promos and a two-issue magazine containing bonus models in these areas, and as alleged by fans, the toys seemed to sell well enough, whereas in America they got put on clearance almost immediately after release (even though American toy prices are in general way lower to begin with). The final Bionicle wave also saw a limited release in the States and no release at all in the Asian-Pacific region, but they were released as normal in Europe.
Searching for Bionicle on YouTube also reveals an inordinate number of videos come from Russian fans.
Hasbro loves to spoil China and Canada with Kre-O.
Mego's Micronauts remained popular in Italy for a few years after their all too brief popularity in America. Known over there as "I Micronauti", their run of the toyline included several figures that were not part of the American line, especially the Magno-figures such as King Atlas, Green Baron, Red Falcon, and Emperor Megas.
The European GoGo's Crazy Bones toys were the top gift for children aged 6 to 8 in, of all countries, South Africa, according to one of the country's newspapers in December 2009.
The Australian toy line Shopkins is HUGE in North America, which has received tons of merchandise, three Direct-to-Video movies made in the country, and even a live show.
Hatchimals were made by a Canadian company, but were the biggest toy for Christmas in the United States when it came out, and the country got tons of merchandise based on the toy including cosmetics, jewelry, storybooks and board games. The franchise is also big in Japan, where it's marketed as Umaerete! Woomo.