Voldemort never loved anyone. Except maybe his Nagini.

I would have expected to see Eileen - Severus' mother - in the list.

@ LadyNottingham: I just chose those who were around during Harry's time at Hogwarts. Otherwise I would have also included Lily.

I think Voldemort genuinely liked Snape the best out of all of the above. He trusted Snape as much if not more than Dumbledore did, he saw Snape as someone who was competent and could get the job done. And even though he killed Snape, he regretted having to do it . I don't think Dumbledore liked Snape. He used and manipulated Snape and repeatedly showed disregard for Snape's feelings and well being. He as much as said to Snape he thought Snape was the kind of person who had no problem watching people die.

Albus trusted him with his life and he always knew the truth, he respected Severus and I think Snape saw Dumbledore as a father figure seen as his own was a poor father

Albus,Minerva and Lucius.

I was pulled between Albus and Minerva. I kept trying to think, who, of those listed really knew as much as possible about Severus and still liked and admired him.

And then I thought that, Albus asked so much of him, that he may have cared for him, but he had no problem using him as a chess piece and sacrificial pawn.

So, Minerva it is, someone that remembers him as a child, knows him as a coworker, and fellow Order member, House opponent, and still had affectionate respect for him.