Is this some kind of personality profile?
No. These are question sets for getting to know yourself, and for fun. They aren’t a clinical or therapeutic tool of any kind, and nothing here is medical, legal or financial advice.
Will my result change every time?
No. Your result is calculated from your answers: the same answers give the same result. Lina only writes that result up for you. She doesn't choose it.
How is this different from the Tarot relationship spread?
Love asks "what's happening right now?", so you can understand yourself and your relationship. The Tarot relationship spread asks "what do the cards say about this question?" and gives an in-the-moment reading on one question. Manifestation · Love asks "what do I want?" and turns it into a daily practice.
Do I need my birth details?
Not for the three question sets. Your answers are all it takes. Birth details are only needed for the Relationship Chart, because it compares two real birth charts.