It’s not a personality. There is no concept of replicating a person, personality or behaviours because the software is not the simulation of a living being.

It is a query/input and response format. Which can be modeled to simulate a conversation.

It can be a search engine that responds on the inputs provided, plus the system, account, project, user prompts (as constraints/filters) before the current turn being input.

The result can sure look like magic.

It’s still a statistically present response format based on the average of its training corpus.

Take that average and then add a user to it with their varying range and then the beauty varies.

LLMs can have many ways to explain the same thing more than 1 can be valid sometimes; other times not.