What is the ruling on personality analysis, such as determining color or birth date, and is this considered knowledge of the unseen?

The types of personality analysis have been previously explained: some are divination and polytheism (shirk), some are ignorance and futility, and some are true knowledge. Personality analysis through color, date of birth, and the name of one's best friend falls under ignorance and conjecture. It may even reach the level of polytheism if one claims knowledge of the future or what is in people's souls. Since you have stopped watching that and regretted it, complete your repentance by not returning to watch those clips.