Ask HN: Favourite Prompts for Adding Personality to Assistants

I'm working on making a conversational AI assistant feel more engaging and personable, and I'd love to know what kind of prompts you use (or have seen used) to add personality, character, or warmth to virtual assistants.

Whether it’s for fun or practical use cases, I’m looking for creative ideas that make an AI more relatable, like specific phrases, unique speaking styles, or interesting backstories.