"But how long until we're out of Recommended Characters?" - Fries
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Recommended characters, in the simplest form, are fan characters "recommended" by fans of BFDI(A) or BFB. While Bomby made a cameo appearance in Insectophobe's Nightmare, recommended characters officially debuted in Lofty. All 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, but this was somehow removed in BFDIA.
In BFDIA, a "Top 25" mechanic was used, meaning that the creators used Google Moderator to choose the Top 25 recommended characters from all of the recommended characters according to that.