While I'm not fully trusting him either, I don't think one can make any kind of determination regarding psychopathy based on body language. Also keep in mind that all political candidates for office receiving training for public speaking. Frankly after listening to him talk about a number of subjects I think the opposite of you, that he is a souled being who wants to help Americans. That's interesting.
I think you have missed some of the stories written about him in the MSM recently:
Presidential candidate Vivek Ramaswamy boosted multiple far-right conspiracy theories during the GOP debate on Wednesday night, in a dangerous mainstreaming of once-fringe claims.
www.wired.com
Vivek Ramaswamy called the Jan. 6 attack an “inside job,” claimed that the 2020 election was stolen by “big tech” and suggested that the “great replacement theory” was Democratic policy.
www.nytimes.com
He's one of the few voices talking about the 2020 election being stolen and that Jan. 6 was an inside job. He also just endorsed Trump for prez. Perhaps we ought not demonize him so much.