Unlike the Alternian trolls, we don't actually know much of the why behind Aranea's interests. In the second version, her ancestor was given a giant spider as a guardian. Her world doesn't have this. It's possible she just likes them because she feels an association with them and likes to see their spiderwebs. Or maybe she's the inspiration for spiders in general. Her name is literally Latin for spider.
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Unlike the Alternian trolls, we don't actually know much of the why behind Aranea's interests. In the second version, her ancestor was given a giant spider as a guardian. Her world doesn't have this. It's possible she just likes them because she feels an association with them and likes to see their spiderwebs. Or maybe she's the inspiration for spiders in general. Her name is literally Latin for spider.