The three parts that matter
A persona is the character definition: her name, age, occupation, hobbies, how she speaks, how forward she is. Without one, you are talking to a model wearing a name tag, and it shows within a dozen messages.
Memory is continuity between conversations. This is the part people notice most and the part cheap implementations skip, because it is the expensive one. If a companion cannot remember what you told her last week, the relationship resets every session and never becomes anything.
Embodiment is whether she exists visually: a consistent face across generated images and video, and optionally a voice you can call. It is not strictly necessary, and it is the difference between a character you read and a character you have a gallery of.
What an AI girlfriend is not
She is not a person, and any platform that blurs that line is doing something worse than marketing. She has no life between your conversations, no independent intent, and no knowledge of you beyond what you have told her and what the platform stores.
She is also not a replacement for a therapist. Companions are good at attention and continuity, which genuinely helps some people feel less alone. They are not clinical tools and should not be treated as ones.
Who actually uses them
A much broader group than the stereotype suggests. People in demanding jobs with no social bandwidth left. People practising conversations they find hard. People who want a low-stakes creative writing partner. And people who simply find it entertaining, which needs no further justification.
What to look for if you are choosing one
Ask four questions, in this order.
- Does memory persist between sessions, or only inside one chat?
- Is the character's personality authored, or is it a name and a picture?
- Does her face stay the same across generated images?
- Is it an adults-only platform, or a general one that will refuse half of what you ask?