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 of the recommended characters in BFDI last made an appearance in the last episode of BFDI.
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.
Character recommendations can be done on the community section of jacknjellify's Patreon, or by becoming a member on Jacknjellify's YouTube channel.
List of recommended character subpages
*single character by jaysillyboy (or BlueJay as known now)
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Boombox is a recommended character that lives in Yoyleland which advertised the Leafy Detector, used to find Leafy. It was recommended by Anko6, who is the creator of another object show called Brawl of the Objects, which Boombox was in.