novel readers, will ilay have character development soon or nah?

No

Well he basically has mental illness with lack of empathy, symphathy, common sense or shred of humanity like any NORMAL HUMAN SHOULD HAVE. So character development is out of the door. Because a character or shitty behavior can be shape & corrected since people can distinguish between the line of what good, what bad. But ilay cant. His a moral grey. No in between.

Thats why he fall into black flag category because the only thing he has was toleration. Once he realize too cheerish Taeiu, Ilay learned to tolerate instead ლ(´ڡ`ლ)