I don't think Vikram will be negative. Perhaps later on, he will become much more grey but outright negative, naa.
I also think that scene where Sugni was lost in her own thoughts of Vikram was significant. She may first be wary and suspicious when he claims her, but I think she will quickly realize he's not interested in her. She will then become even more in awe of him. He will slowly fall for her, as much as he tries not to. That's what that last promo is indicating, I believe. I think that last promo is more indicative than the other promo where it shows him claiming her for himself.
That last promo is showing someone who has feelings for her; and though she is not interested and rejects him, she is not exactly repulsed by him either. Meaning I see it more like a relationship where one views the other non-romantically but has feelings of genuine depth (gratitude, awe, friendship, whatever), while for the other it has become romantic.
Of course thrown into this all the other possible aspects, such as Vikram's using her in his battle plan, etc.