Kawa-chan debuts as a regular customer in the series' third chapter, noted for his distinctive rapper-style attire. His visits to Snack Basue are infrequent, explained in episode 15 by his patronage of another snack bar. Following a prolonged absence, he dramatically reappears in episode 67 with an extremely obese physique. During this return, he actively pressures Akemi and Kosame to accept his changed body. Subsequently, Kawa-chan achieves significant weight loss through successful dieting. After attaining his weight loss goals, he adopts a demeanor of superiority towards others.