Ethel Muggs (originally Ethel Dinklehof) was portrayed in the early era as a tall, homely, somewhat boy-crazy individual that had a huge infatuation with Jughead Jones.
Jim died very soon after, so Jughead sat in with Jim's friends on the corner to play one last, mournful version of "St. James Infirmary Blues".
Rivera came up with the name of Yoyo Boing for representing Jughead; the name "Yoyo" sounded close to "Jughead", and the "Boing" part was a gimmick Rivera developed for the character: a vocalized "boing" that he constantly repeated to fill in silence gaps during each episode.
This is mainly due to Moose knowing that some boys, namely aromantic Jughead Jones and shy Dilton Doiley, would never come between him and Midge.
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Dilton Doiley is going to M.I.T. for his doctorate in quantum mechanics, Reggie Mantle will fulfill his destiny as a used car salesman in Atlanta and Jughead Jones will stick around Riverdale grilling burgers at Pop Tate's Choklit Shoppe until he figures things out.
While the name of the search engine "Archie" was not a reference to the Archie comic book series, "Veronica" and "Jughead" are characters in the series, thus referencing their predecessor.