Emi

Emi is a girl that Light Yagami used to date.

Plot
After Light kissed Misa for the first time, Ryuk mentioned her and Shiho that Light used to date.

Misa mentions Shiho in her love diary seen in How to Read 13 in a section where she talks about how she defeated other girls Light dated in the pursuit for Light. Shiho, along with another girl, is categorized under "other sluts". Misa states that anyone who was never shown automatically loses.