That is intersting because "genki" wasn't the first term that came to me when I think of Zessica or most of the other characters you mentioned,still not sure I'd use that word with Zessica but regardless your description does fit.
Though to me the big difference with the three exemples is that they got to be in the spotlight in the show they were on more than Zessica has here.
I think a lot of characters would fit that description,not sure if it's really a recent trend but rather one of the "classic" character types.
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