Yumi's interest is similar to her twin, which is love to shop and will go shopping together with Ami. He has a friendly relationship with Ami although they sometimes fight like other siblings. He and Ami have a strange relationship, that is, they can read the minds of one another. He has a pet cat named Cat. They sometimes quarrel. But even though they were fighting, he still had the heart to help the Cat.
Yumi has a hairstyle similar to Ami but her hair is curly and covers her left side. She usually wears a high school uniform, which is a pinafore light blue school with a deep white corolla, a pair of socks and white shoes.
At home, Yumi wears t-shirts and short pants. During his trek through the woods, Yumi wore a white t-shirt and a long green outfit with a brown tents bag.
- Yumi often appears in the Lawak Kampus series compared to Ami.
- She, Teacher Noodle, Pen and Dr. J share the same hairstyle.
- She does not care about other people's stuff. She's just a story about her stuff.
- Her name and Ami are taken after the Japanese rock/pop duo, Puffy AmiYumi.