Really throughout TOS did Spock not kill anyone directly?
I thought he might have killed in Friday's child though.
As I already mentioned, yes, he did shoot at least one Capellan with an arrow in "Friday's Child." Of course, arrow wounds are frequently survivable in real life, but by TV rules, faceless mooks who get hit by arrows fired by the good guys are presumed dead.
Well I agree with you then.
How about any of the other main characters aside from Kirk (and McCoy)? Certainly Uhura didn't.
Now I don't think there was as much killing as I thought I remember. (if that makes any sense)