Anime Side Characters who more popular than Main Character

Even though the main character (MC) often gets the most highlights, details, and flashbacks, they are sometimes outshined by other characters, even those with limited screen time. This can be due to differences in skill, characterization, or impact on the story.

1) Kurumi is arguably the most popular character in Date a Live, despite her supporting role in both the light novel and anime.

2) Despite Gojo's immense popularity, Jujutsu Kaisen author Gege Akutami has openly expressed his dislike for the character.

3) Gintama uniquely features a "popularity arc," possibly the only anime to do so.

4) Sinbad was initially a supporting character in Magi: The Labyrinth of Magic and Magi: The Kingdom of Magic but eventually earned his own anime, Magi: Sinbad no Bouken.