I went through all the Core/CGI materials I do have and the closest thing to a height chart than I have are the concept designs of the main cast in Earth clothes.

So we can see that Duncan is the tallest of the kids, almost as tall as Keldor. Adam is shorter than Duncan but taller than Teela, and Teela is the shortest of the kids pictures.

Marlena is also almost as tall was Keldor.

All other character heights, your headcanon is as good as mine.

This depends on which version of Eternia from which iteration of the franchise you're working off of.

Human Eternians don't like non-humans (and especially Gar) in the Classics line. The subject is up for debate in the 200X cartoon.

As for Filmation, there appears to be no tension or distrust between the races of Eternia (except for a few one-off single-episode examples that are resolved by the end).

I think, after being separated from their daughter for so long and finally being reunited, Randor and Marlena wouldn't care that Finn is non-human, they would just be happy that their daughter is alive and thriving enough to give them a grandchild.

I know this isn't how it happened in Filmation. But I'm declaring this canon.

There was a fan theory floating around for a while that Marlena was Mosquitara. That after Adam was kidnapped, she left on a quest to get enough magical power to get her son back. But at some point along the way she lost sight of her goal and it became about just getting more and more power for power's sake.

It was an interesting fan theory and I honestly did like it for the drama, but I don't personally subscribe to it.

My personal headcanon until proven otherwise, is that after Adam was kidnaped, Marlena and Randor experienced extreme marital problems. Marlena was grieving her lost child and maybe some advisor from the court, or even Randor himself, was pressuring her to have another child so the monarchy would still have an heir. Marlena couldn't process her loss in such a high-pressure and toxic environment, so she gets back in her Rainbow Rocket and flies back to Earth. Marlena is still on Earth at the time the Core/CGI series takes place.

That's why Randor only ever says he "lost" her, not that she's dead.

As far as I'm aware, Filmation is the only iteration of the franchise to give Marlena a meaningful backstory.

In 200X, she's just sort of there.

And in Core/CGI she's not even there! She's just a painting of a woman that was present in Randor's life at one time but is not inexplicably gone and we don't know if she died or just left him.

At least Rev built on Filamtion's backstory that she was a pilot from Earth. That was nice.

I could go for that. In the portrait, Marlena seemed to have a very thin frame. She was seated so its hard to guess her body type, but I could believe that she's long like Lyn is. Adam and Lyn being step-siblings is definitely a twist nobody would expect!

The one thing that holds me back on this is that if she were Marlena's daughter and Adam's step-sister or half-sister, that means that Randor would also have a familial connection to her as her step-father. But Randor did not display any kind of familial feelings to her. Not concern over her safety, or disappointment over her betraying him and supporting Keldor's coup. I feel like for Lyn being Marlena's daughter to work, Randor would have to have some kind of feeling about her. Whether is be disappointment, sadness, or rage. But I don't even think Randor even spoke to her expect for "Kronis and Evelyn, I presume."

Also, how old would Marlena have to be to have a daughter Evelyn's age? I don't have my guidebook handy at the moment, but I think Lyn is supposed to be Keldor's age. Would Randor have gotten with a much older woman? Is that why Marlena is no longer around in the main time period of the show? Has she simply passed away from old age?

You've given me a lot to think about.

Great ask!

The Crown Prince is being made to clean up his own damn mess.

I found these memes on my desktop and I vaguely remember making them, but I don't remember when or why...