Yasuda is a supporting character in Yotsuba&!, a manga and anime series centered on the everyday adventures of Yotsuba Koiwai. He is a teacher at Yotsuba's school and is known for his somewhat awkward, earnest, and often comedic presence. Yasuda frequently appears in school-related scenes, where his interactions with students and staff add humor and warmth to the story. He serves as a minor but memorable figure in the series' slice-of-life cast.