I'm not much bothered by the 'personality' of party leaders unless it has clear implications for his policies or trustworthiness. Do I care that Brown shouts at people? No. Do I care that Cameron dyes his hair (so I am told by someone who sees a lot of him)? Not much, though it hints at a slight talent for deception. Do I care that Chris Grayling wants an opt-out for B&B owners who don't want gays in their house? Yes, bearing in mind that he may become Home Secretary, in the party of Section 28.
But for what it's worth, I won't be voting for any party, or for the leadership of any party, I'll be voting to return my current MP, who seems hardworking and who hasn't abused the expenses system. Those are I suppose matters of 'personality' rather than policy.