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9'δ (pronounced Nine Delta) is a supporting character in Darling in the FranXX. She is a female pistil (the female pilot role) in the elite special forces unit known as the 9's (or Nines), a group of enhanced parasites created by Dr. FRANXX and directly controlled by APE.

She is partnered with 9'ε (Nine Epsilon) and pilots the white/gold 9 Model FRANXX unit. Among the Nines, she stands out as the shortest in stature and has short light green hair matching her eye color, wearing the group's signature white-and-gold uniform.

In terms of personality, she's often portrayed as cheerful, mischievous, curious, and somewhat playful (with a smug side in combat situations), contrasting the more serious or arrogant tones of some other Nines members.

She appears mainly in the later episodes as part of the antagonistic/elite squad that interacts with Squad 13.