not nathan for sure ;)

Or Julian

or Julian (:

lol! that's what I thought Jess, but with Lucas, of course.

i kind of see Luke being an annoying father

I guess..
Nathan and Lucas are too hot.

As much as I love Nathan, I think Julian would be an incredibly loving father. He strikes me as someone who'd love his children no matter what, who would support them and who would always put them first. I mean he was this close to having no children at all that he'd love them even more. And of course he knows how it feels like to have a dad who's stopped loving him at one point.
I've probably seen too much of 'Daddy Nathan' to say that he's a perfect dad...