Yiba is the first-born daughter of Souta and Nozomi Kobayashi, formerly of the Spider Clan. Born in the months following the destruction of the clan, her early life was defined by this event and her family's eventual decision to settle in the Lizard Clan.
 
While lacking any sign of the family bloodline's gifts herself, Yiba's family was blessed with the birth of twins, Kana and Daido, with the bloodline gifting them greatly. This was taken as a good sign by the family and a blessing for those who had lost so much of their heritage. While they are still young, the family has high hopes for the twins.
 
Yiba learned the ways of shinobi and the family styles from her uncle Genkei, a skilled Jonin left embittered by what happened to the rest of the Clan. In the years since joining the Lizard Clan he has earned respect for his skill but is still kept at a distance by most outside his family due to his loyalty to what remains of the Spider Clan.