- This card is the female equivalent of "Gagaga Child".
- Given that "Gagaga Sister" has blonde hair like "Gagaga Girl", it is possible that the two monsters are siblings. This would help explain its name: "Gagaga Sister".
- Another hint to this is the pink ribbon and skull accessory "Gagaga Sister" wears - "Gagaga Girl" also wears a pink ribbon on her back and has a cellphone with a skull accessory on it.
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