My 2 cents about this whole reference thing: "Q-taro" is actually a reference to the Fujiko Fujio duo's manga
Obake no Q-taro, about a ghost living with a family. If Wikipedia is to go by, this ghost was also referred as Q-chan (Kyuu-chan
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), too.
...Also, highly possible, the Jojo reference thing from Part 3 is actually an
Obake no Q-taro reference, too.