Fairies seem to be real. In "The Roof Fairy" episode, Chelsea makes up a fairy called the roof fairy that appears on your roof the night after the tooth fairy comes. Barbie wants to bring the roof fairy to life for Chelsea, so she and her sisters ask Ken to dress as a fairy and go on the roof. He dresses as the roof fairy, but he falls when he tries to go on the roof. However, the roof fairy really does appear. Barbie and her sisters can't think of a logical explanation, so it's hinted that the fairy was real.

Oh that's neat! That's an episode I haven't seen. But did other characters see the fairy? If not, it could be Chelsea's imagination in a Dreamtopia sense.

I think they all saw it.

Yep, they did all see it. But not sure about mermaids....because even Barbie said in Magical Mermaid Mystery Part 4- that she doesn't know what she saw in the lagoon (it was a mermaid faced like her). But not sure!

There's a Dreamhouse Adventures special called Barbie Dolphin Magic. There are different voice actors but Barbie and her sisters go to a resort with Ken, and they meet a mermaid named Isla.

I think the current voice actors are better, what's your opinion?

I like both Erika Lindbeck and America Young as Barbie. I think every Barbie actress has suited the era of Barbie movies that they starred in.