Spider-Man: No Way Home Trailer Dropped - The Loop
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Recommended characters, in the simplest form, are fan characters "recommended" by fans of the series. While Bomby made a cameo appearance in "Insectophobe's Nightmare", recommended characters officially debuted in "Lofty". All but one of the recommended characters in BFDI last made an appearance in the last episode of BFDI.
In "Reveal Novum", only one character per one recommender was allowed due to "budget cuts", which was the in-story reason. The real reason is unknown. This restriction was removed in BFDIA.
In BFDIA, the characters were recommended using Google Moderator, and 25 recommended characters with the highest score were picked to be displayed in the episode.