I like to imagine that it was his sister.
@Darth Prime
Btw, has Robin Haki or not? I keep forgetting, with observation Haki alone she would be much stronger. Because then she only needs to feel them to grow some limbs on them. With Armament Haki and knowledge of some martial arts moves, she would be one of the strongest members again.
I saw some fanart and theories how strong she could be with the Rokushiki technique. Bad Ass!
I saw some Rokushiki Robin fanart as well!
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