...well that escalated quickly
i love the Legend of Rebirth fanfic about Klonoa so much i get it's canon mixed up with the actual game canon. now because the story is unfinished, it's hard to say what it's idea of the Goddess Claire was, but i think either Klonoa is Claire reborn (cause Popka says he reminds him of her) or that Lolo is her descendant.
those 2 theories are in that fanfic (i think it's been awhile since i read it) and i think they make the most sense
Edit: *re-reads this post the next day* ...man this makes no sense. What was i thinking lsst night? Guess my brain doesn't work at 1am.
Anyway my REAL answer is that i think the goddess claire was the queen of sorrow, and ruled over the kingdom of sorrow with the king of sorrow. People thought sorrow was bad, so they removed it from her, and they started worshiping her in La-Lakoosha. The king of sorrow was so upset that he started attacking the other kingdoms, causing them to seal away him and the kingdom of sorrow. And that's that. La-Lakoosha is the kindom of tranquility, so they wanted a pure goddess to rule over them. So they took someone, and did just that.
That's my theory at least
Edit during the edit: oh i just thought of anoter thing! Maybe the people living in La-Lakoosha weren't truly pure. So they wanted a goddess to rid them of all evilness. However by trying to achieve this, they became worse by taking clare from her kingdom. It shows that everyone has a little evil in them. For example, the priestessess that tease Lolo. They live in the kingdom of tranquility. Shouldn't that be against the rules to do? Even Lolo herself was selfish at the beginning, only wanting Klonoa to help her ring the bell. It shows that everyone, no matter who they are, isn't completely pure
Again, this is just my theory. I kinda thought it up out of no where XD