Ai-chan is the main character of the anime series 'Tawawa on Monday'. She is a high school student known for her cheerful and innocent personality. Ai-chan's interactions with her fellow commuters, particularly the salaryman who she meets every Monday morning, form the core of the series' episodic slice-of-life storytelling. Her character embodies the themes of everyday struggles and the small joys that accompany mundane routines. Ai-chan's charm and positivity often uplift those around her, making her a relatable and endearing character to the audience.