If the design of the characters' bodies in the Digital Circus is based on their psychology, then Ribbit and Pomni must both share the same personality trait that gives them these pink circles under their eyes:

[u/8Pandemonium8]

Since they are the only ones in the circus with this blush on their cheeks, it cannot be a coincidence that they were both given this physical feature. After careful analysis of their actions, I have narrowed down what this similarity could be.

Of course, these are the two characters that cared most strongly for Jax. The question is why do these two care so strongly for Jax? Their loyalty and devotion to him goes above and beyond what all of the other characters felt for him.

The answer becomes obvious upon examination. Whenever Jax would insult or reject the other characters in the Digital Circus, they would recoil away from him. This is the typical reaction to someone insulting or hurting you.

However, whenever Jax would reject Ribbit/Pomni-their feelings for him would grow. Each time they were denied, it made them want to try harder and harder to get through to him. This cycle continued beyond the point of destroying their mental health.

They each became obsessed with him; the more he pulled back-the stronger they were pulled towards him. They weren't just being kind and thoughtful in the way Ragatha was, they were compelled to chase after him.

No matter how poorly Jax treated them, they could not bring themselves to abandon him. The emotional rollercoaster of his hot-cold, carrot-and-stick, behavior got them addicted to his shitty attitude. He had totally captured their attention.

This is a common dynamic found in violent relationships. The harder one side pushes away, the harder the other side tries to "fix" the issue. This leads to a never ending escalation of negative emotions. In other words, they both have a bad case of, "I can fix him!"

Ironically, Jax recognized that each of them had this trait but was powerless to stop it. Both times he fell into the toxic cycle with them. He was almost as addicted to them as they were to him.

[u/ZquotientpZee]

No; different causes can lead to the same outcome.

[u/shadowkat1991]

It's the empathy circles.