https://en.wikipedia.org/wiki/Nure-onna
The Name Nerona has resemblance with the name Nure-Onna. Looking at this specific picture of its wide mouth with sharp teeth and the ability to "consume humans", the emphasis lies on consuming, which could also refer to Imu consuming Sabo's flames, also being described as a snake like creature with a woman's head, it may fit Imu.
Depending on the depiction, the Nure-Onna also has arms on its snake body, so especially in its human-beast form you could explain why Imu's silhouette in Zoan form still had kind of a humanoid form, albeit still looking kinda bizzare and deformed, almost snake-like.

The Name Nerona has resemblance with the name Nure-Onna. Looking at this specific picture of its wide mouth with sharp teeth and the ability to "consume humans", the emphasis lies on consuming, which could also refer to Imu consuming Sabo's flames, also being described as a snake like creature with a woman's head, it may fit Imu.
Depending on the depiction, the Nure-Onna also has arms on its snake body, so especially in its human-beast form you could explain why Imu's silhouette in Zoan form still had kind of a humanoid form, albeit still looking kinda bizzare and deformed, almost snake-like.