He's 'just Ken' but will the 'Barbie' movie change his popularity?

On and off the big screen, it's Barbie's world and Ken is just living in it.

As reflected in Greta Gerwig's blockbuster movie that tackles the legacy of Mattel's famous doll, Barbie has always been more popular than Ken.

For every Ken doll sold today, there’s generally eight to 10 Barbies sold, according to Jim Silver, a toy industry expert and CEO of review site of TTPM.

It's unclear if Warner Bros' 'Barbie', which was also co-produced by Mattel, will increase Ken production and sales. But Silver noted that the movie "gave Ken more attention than Ken has received" in decades.

Ken was first introduced back in 1961, two years after Barbie hit store shelves. But he hasn't had nearly the same impact on the Barbieverse since.

“Barbie’s world is about Barbie. And (to some), Ken may be an accessory of sorts," said Ed Timke, an assistant professor of advertising and public relations at Michigan State University, pointing to years of marketing that has, naturally, put Barbie at center stage.

The new attention around Ken following 'Barbie’s' release has also received pushback. Many note that the movie is about Barbie — not Ken — and that's where the spotlight should stay.

Still, the dynamic between the film’s Barbie and Ken may get people to reflect some big questions about gender as well as Ken's own evolution over the years.

Ken's relationship to Barbie has been up for debate since the two hit the toy aisle together. While Mattel long-advertised Ken as Barbie's boyfriend — and even detailed their 2004 split and subsequent reconciliation seven years later — many also saw Ken as Barbie's best friend.

Popular versions of Ken ranged from the tuxedo-wearing 1984 Dream Date Ken, to 1978 Superstar Ken and 1979 Sun Malibu Ken, which became one of the doll's most iconic looks (as reflected in Ryan Gosling's character).

While Ken has gone through far fewer career changes than Barbie, his resume boasts job titles like astronaut, barista, country western singer and doctor.

“A wonderful thing is that through play, children are free to have their dolls take on any type of role that they wish,” said Ann Herzog, a clinical instructor of child life and family-centered care at Boston University.

She also underlined the importance of diversity in toy collections and providing “open-ended play opportunities and not to endorse stereotypes that the Barbie collection and dolls in general are only specific to a particular gender.”

• Barbie's cultural impact: Beyond toys, embracing diversity and challenging beauty standards