Personality is being used very loosely here. The issue I've had with existing AI assistants is that they sound too robotic, and they repeat the same patterns in their sentences -- ("you're right — ...") the "declauding" skill in this repo" has a good example of it (https://github.com/oaustegard/claude-skills/tree/main/declauding).
How are you making your AI sound as non-robotic as possible?