My middle daughter has also just started on her questions so she is in the same mindset as you right now, trying to pick the right questions and answers to showcase who she is to the admissions officers. My oldest daughter went through this process last year, and applied to 5 UC campuses, was accepted at 4 and waitlisted at 1 so I guess her personal insight questions were pretty good!
My first thought is that looking at the changes made to the application this year, the UC’s have acknowledged (maybe inadvertently) that not everyone needs to be a ‘leader’. You can make just as worthwhile a contribution through your creative side, or your involvement with the community and team players are just as valuable as that all-important ‘leader’. It seems that way anyway, giving the students a chance to expand on other areas of their extracurricular activities instead of pushing this idea that everyone needs to show leadership in every endeavor!
Choose any of the questions but concentrate on your passions, what you do well, how you interact with others, how you will be valuable to the university as a student. As you said, Prompt 3 is not a good idea unless you turn your meticulous nature into a positive - attention to detail, making you a methodical thinker, etc., and I’m sorry to say that prompt 2 makes you sound like a daydreamer (which there is nothing wrong with, but I’m thinking admissions officers are probably not looking for). You could certainly use some of it though, to show that you are a creative person - I would just tweak it so that it shows more of your creative side and less of the ‘dreamer’.
And above all, whatever you decide to write, check, check and double-check that punctuation and spelling! Have a school counselor or other trusted adult look over your final answers before you submit them and take any suggestions to changes as positive criticism - I hope some of that helps you.