Younghee Mandlebom was a student in Leonard's class that was from Korea and Leslie's best friend. Like all the other kids, she was always insulting Leonard and beating him up. But, she actually cared for him and showed that she crush on him at least twice. Younghee's parents owned a restaurant. She was often seen hanging out with her best friend, Leslie. She also had great elocution.
Younghee is a 10 year old little girl with green skin and black hair. She wears a yellow tank top, red shorts, and black Mary Janes.
- Younghee is similar to Helga from the Hey Arnold franchise. They both bully the main character but actually have crushes on them.
- She is voiced by Lauren Tom
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