If only I could find a way to use this...

[classicdrogn]

Bob, they're in Japan, and Usagi is a confirmed, canonical manga fan. Why would she NOT cosplay as a fellow warrior princess in the lack of corporate IP concerns?

Even if there's no DC Comics in her world, Doug has been traveling and collectiong various media for quite some time, and is her superheroing mentor as well - slinging a run of one of the versions closer to the original conception as a heroic role model for girls her way isn't too far fetched, surely?

E2: Or Usagi could find his comics stash herself on one of the times when she's pillaging his archives for new music and stuff, for that matter. Like if she searched for stuff about princesses but didn't specify the medium/format.

ETA: Usagi's powers are pretty much "what Usagi believes her powers are" so when the inevitable monster attack interrupts, she could very easily still have the lasso and discover it works more or less as depicted after transforming, if she's thinking something about how it would be really useful to have a capture option to deal with mind-controlled civilians or an enemy they need information from at the time...