Ane Wa Yanmama Manga [updated]

While not the main focus, one of the kindergarten teachers has a sister who is a textbook yanmama. The episodes featuring her are fan favorites: she shows up to the kindergarten festival in a leather jacket, challenges a clown to a fight, but then tearfully thanks the teacher for being kind to her nephew.

Though the main plot focuses on a delinquent boy and a studious girl, the side character—Hana's older sister—is a proto-yanmama. She gave up her delinquent life to raise a child but still rides a modified scooter. A spiritual predecessor to the trope. ane wa yanmama manga

[Attach a panel from the manga or a fanart] While not the main focus, one of the

(By Miki Yoshikawa)

Instead of standard SFX, you can use stylized text to emphasize action. While not the main focus