I mostly use it as a tool, but the conversational back-and-forth is what makes it useful for brainstorming—it can challenge a half-formed idea before I commit to it. I haven’t given mine a persona name; I keep it as “assistant” so I don’t overtrust it. For me the sweet spot is treating it like a sharp colleague who’s sometimes wrong, not a friend or an authority. That said, I understand why naming it makes the interaction more enjoyable and memorable.