I don’t think Nightblood would be classified as alive. I know Kandra aren’t and never were human, and can be influenced, but I think that the are living beings. (They grow, can reproduce like humans (I think), breathe) but nightblood is a disembodied mind in a sword. I ddon’t think it would be possible.
By the way, when you said “hard to be pushed,” you meant steel, correct?