Book where MC is out of the limelight due to being less interesting than a more quirky/cool side character, but the MC takes it back after going through some change?

Something like Attack On Titan where the Main Character, while important due to his Titan and connections, is not as loved as a side character like Levi, who is extremely strong and snarky, causing fans to like him more. Eren took the attention in Season 4 when he became more ruthless and stoic and changed his hair style, looking more attractive.

by BoloIgHau