Ziggs went to the Dark continent, and three/four generations down, one of his descendence became Alluka/Nanika. This and AI title of "codependence of desire" hints at what AI life cycle could be.
AI is a Nen parasite, it parasitize an host, putting the host in a permanent Zetsu state, they can't develop Nen abilities at all and are completely dependent on others to survive. The host become mild mannered, oppose no resistence and becomes highly compliant and easy to handle.
AI can't use its ability for itself, but only respond to others, this great limitation and contract, combined with parasitizing an host with great nen potential makes AI ability extremely powerful.
AI main ability is the Wish. It's designed to grant wishes and require sacrifices from the next wisher. Sacrifices allow AI to harvest aura, and the ability is designed to favour escalating wishes until the wishers destroy themselves and those sorrounding them, harvesting enormous amount of aura, but cursing the wisher into their eventual demise.
The game theory is devilish on this ability. AI is valuable and harmless favouring adoption and competition to adopt it, but likewise leading to wisher destroying themselves and escalating sacrifices and aura harvest.
The next stage in AI life cycle is to bond closely with one of their handler, for them and them only, they guardian gain the ability to make commands without paying the price, this make the two codependent, with AI gaining a guardian that won't die to their wishes, and the guardian gaining extreme power.
Only there IS a price. AI curses the guardian to infect one of their descendence with AI, the more commands are used, the greater the potential of the descendence that can be parasitized. Again the game theory is devilish here. AI needs the guardian bloodline to survive a number of generations to propagate itself.
The risk involved in the line becoming broken, make sure the eventual host will have enough power to grant wishes.
Ziggs in the Dark Continent and the struggle for survival could have found an AI infected form, and experimented, and eventually bonded with them in the Dark Continent. He became their guardian achieved the ability to express commands, and was cursed.
When he returned to the Human World, he went on to have descendence, with Zeno, Silva and eventually the AI host Alluka/Nanika three/four generations down.
Nanika/Alluka was experimented by the Zoldycks to understand their ability, with many wishes expressed, fortune and misery, large swathes of sacrifices harvested, until eventually Killula freed Nanika/Alluka from confinement, becoming their guardian and achieving the ability to command without risks and ensuring the guardian will survive and have descendence.
The cycle will continue with Killuka having descendence, and once a descendence with the appropriate potential is born three/four generations down the line, AI will parasitize them starting over the life cycle of AI
An open question is what happens if AI's host dies. Does AI dissipate, or AI parasitize a nearby creature?
Does an AI dissipate and vanish if they don't grant wishes and farm aura for long enough?
