In this episode of Sket Dance, a mangaka named Enta Hinohara [based on the author of the series, Kenta Shinohara], finds his way to Kanmei High School in search of characters for his newest manga series. Thus, Bossun attempts to become the character he needs.
Enta vs Bossun
However, Enta considers Bossun's talents too plain for a shonen protagonist, leading the Sket Dan on a merry adventure to try and prove that they're worthy of becoming shonen protagonists.
However, on their journey to do so Bossun accidentally gets turned into a toddler.
Bossun the toddler
Still, even in this state Bossun manages to stop a purse snatcher and show off his true worth. Unfortunately... the mangaka still doesn't acknowledge him as main character material, but takes him as inspiration nevertheless. Just... not in the way that Bossun would have expected.