I feel like Neal and Levi would get along rather well considering Levi's law background and the fact that Levi always knows for sure if his client is guilty and how to get the perfect evidence. I could see him being willing to work with Neal to make sure someone accused of a crime that's actually innocent isn't put in jail or even recommending Neal to people who are innocent but accused of crimes and it looks bad.

Clint would probably hate Neal except that seems like the sort of thing that Neal likes and Clint wouldn't give him the satisfaction. But seriously he hates the guy.