Don't make her seem so useful
Maybe because she is. Even the plot dictates that Harle's mission was very important to the Dragon Gods, and Harle, whether she knew what she was doing or not, was doing it on behalf of the planet.
She's a component. She's needed to complete the Dragon God. This is fact. It's also fact that alternate endings in the Chrono Series don't have to take into account other facts. For example, the Frog marrying Lenne ending.
Like I already said, her mission was to remove the flame from Chronopolis to free her brothers and sisters. If Harle has their power and they desperately need it, then they absorbed her for that reason. But as I said, the ending already shows us that she does not need to be absorbed in order for them to do their thing.
Also, giving me an example such as the Frog marrying Leene ending is kind of lame because that was either a comic relief ending or it could be taken literally, as CT shows us what happens when one meddles with time.
Yes, she'd still have her skills. They'd just have different names, I guess. The Dragon God's astral bodies would be all seven.
We don't know that for a fact, if the moon did not exist, then there could not be a "Dark Moon Dragon". The Dragons are based off the elements. Since the 7th element is the CC, Harle is only symbolic for it. Had the Moon not been there, and an element in her techniques, she would have been the "Dragon" of something else.
Harle has never demonstrated empathizing with the planet. And if she was, then she wouldn't be trying to get the Frozen Flame because it's like...THE LAST thing the Planet wants. But yea, her behavior is heavily influenced by Schala's DNA.
Schala has nothing to do with Harle's personality. DNA does not determine your personality. It does, though, determine hereditary mental and physical illnesses. Downs syndrome, Auetism. ETC. Kid is nothing like Schala except in body. Schala doesn't go around killing people, stealing, wearing skimpy little dresses and talking in slang. And Harle speaks french, is psychotically happy and is a part of the planet in the end.
You can't blame Harle for anything. She's doing what her brothers and sisters are telling her to do. And what their view is is that of the planet's. Harle cried on the ship for what was about to happen. She was crying that she would be freeing the dragons, at the expense of Serge. She even shed a tear for humanity in that ending where the humans all perished. But then again, shes also one of those characters that lives by the saying "The ends justify the means".
Nobody could still disprove the fact that Harle is powerful and was only toying with Serge because we all know she needs him in Chronopolis
