According to wiki, they are just friends who met while playing WoW. And she calls him cousin as a joke. But the information may of course be inaccurate.
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But than i check her tweeter media section. And I haven't seen any indication that she's actually very tall.
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Maybe she's choosing that angle to make herself look shorter.
Does anyone have any more pictures of people posing near these figures? Or how tall are these figures? (anime expo 2022)
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ps. Of course we can always measure her body with heads.