Otaku

Western Animation

 * The Powerpuff Girls episode "Collect Her" features a negative example in the from of Lenny Baxter, a fan who spent much of his spare time collecting Powerpuff memorabilia. When Lenny finds out he has obtained every known piece of merchandise, he goes insane at the prospect of not being about to add more items to his collection, leading him to steal the girls' personal belongings and, eventually, kidnapping the girls themselves.
 * Luz Noceda from The Owl House loves making fanfics, fan-art, and AMVs, considers shipping to be Serious Business, and has made a self-insert character for The Good Witch Azula, an in-universe book series that she's a big fan of. Word of God also confirms that she's an anime fan as well.
 * Ronaldo Fryman from Steven Universe frequently mentions weird fictional anime he likes, such as Princess Koala and Beautiful Girlfriend Satan, on his Character Blog Keep Beach City Weird, and brags about owning a $300 replica sword even though it's not even sharp enough to cut through a juice box.