Niall
He doesn't do anything to alienate fans, no official girlfriend, and no tats.
I think the most controversial thing he got into was rurmors of wanking in Japan
Just from interviews/professional duties alone, I'd initially thought it was Liam...
But then he showed his ass on Twitter like a total disaster, so...
I'm actually going to go with Harry.
Harry > Louis >/= Zayn > Niall > Liam
This is what I came to say.
Harry or Louis most likely, since both tend to come across as very smart and well spoken in interviews.
Niall
He doesn't do anything to alienate fans, no official girlfriend, and no tats.
I think the most controversial thing he got into was rurmors of wanking in Japan