I guess if you are asking about other aspects of their life then 10th lord Mercury in the 9th in Gemini with Jupiter would obviously be something that involves mental pursuits but you already mentioned intelligence and that is pretty obvious. Sort of similar to TT's chart recently, the influence of Jupiter and 10th lord in the 9th could show things like working in education, though they don't have Jupiter in the 10th or ruling the 7th, just influencing it, so I don't think they are a teacher in this case. I have Jupiter in Leo in the 2nd ruling the 10th and I have worked in education and government, and I also have Mars influencing career. They likely are well educated but sometimes Mercury in Gemini can be self educated because the person learns easily. As I often mention in the horary forum, Mars influencing the 10th lord or the 10th, especially in a negative way, also can lead to being fired or the person leaving their job(s), such as due to lack of satisfaction or just boredom. I have Mars in the 10th and have gone through dozens of jobs - not fired but just bored or looking to do other things. Mars cuts things too short and makes hasty decisions - the opposite of Saturn, which often takes its time or just too long and stays in work it hates. Also, as someone with a mutable angle myself on the MC, it can indicate dual jobs that have multiple roles or doing two different jobs at the same time. For myself, I either work while in school or have two jobs or jobs that have two roles. I don't think I have ever had a job that didn't fit that criteria or if I did it did not last long.
7th house Pisces is usually prolific for marriage but Jupiter is in a barren sign, Moon is not great, Jupiter squares Saturn and Venus is in aspect with Saturn and under the beams and out of sect, so marriage is difficult, delayed or just denied. Normally 1st lord with 7th lord is good for marriage but Mercury is translating the light of the square from Mars to Jupiter, so that is not easy either.
I am glad I got mental illness right. The problem with people who are very intelligent is that they do often suffer from mental illness but here it is very pronounced with the influence of Mars. I personally pretty much always find it unsettling to see an ASC ruler receiving a bad malefic with a Ptolemic aspect.
I am not really sure what to make of their Venus ruled 2nd in the 10th with Sun but it seems to be another source of income. Maybe others have theories on Venus. SN in the 2nd can squander money but Saturn, especially fixed, there can be cautious and show steady income, such as from real estate, land, etc., so there is some mixed testimony there. I recently watched a video from Lada Duncheva on the NN in the 8th and she said those people are often self sufficient but still have to deal with needing money or resources from others in some capacity. She also said it shows some emotional problems, such as distrust and paranoia of other people's motives, since NN magnifies.
Not bad. Substitute "compete with people" for "challenge people" and you're onto somthing.
Like debating or mind games? They don't seem very political but who knows. Definitely Gemini likes anything that keeps the mind challenged and the 12th likes to analyze problems of any sort. Sharing their knowledge with others in some capacity would make sense with Jupiter in the 11th with Mercury. The 11th is a group oriented house. I have a heavy 11th and I often think about groups more than the individual and he would gain energy from working with others and sharing his mental pursuits.