I do not really understand what you want to do. But I think you want to use an existing AI model and create your own personality from it.

Is that correct?

If so, you want to download ollama and run it. Then you will also download and run sillytavern.

In Sillytavern, you can create different characters and give them different personalities.

This does require some technical knowledge, but it does not require you to code anything. You will also need a GPU with ha decent amount of ram for any complexity.