Eh I don't really agree. Oracle has been working on her craft for hundreds of years. And although she can be childish she still has a lot of wisdom because of her years. Sure Oracle likes having people to test her potions on but she is much more of a professional. I think she'd get along better with Marian's grandma Marjorie.
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I could see them getting along since they somewhat do the same thing. But I'm not sure how long it would last with them. Marian isn't that much great with potions and medicines, and the Oracle makes hers more better. As in spending alot of time on it.