He is bound of be logical the person has Gemini lagan and Mercury is posited in the lagan. However as Sun is also conjoined with Mercury he can be argumentative type person and probably wants to have last word in every thing.
Chances that he will do love marriage are very much there as Venus, Moon is conjoined with Ketu in the 12th house, although he should try to avoid it, but less likely as Rahu mahadasha is also going on.
From your side you can do horoscope matching and if required do remedies of dosha and planets if required.
Blessings,
Navneet Khanna
Astrologer