Weevil is my favorite.
Im through the first three seasons, the movie, and the first book. No one truly gets Veronica Mars the way Weevil does. I never actually wanted them to date or anything but had it happened i personally would not have been upset. My all time favorite moment (so far) was when they were in high school and he asked her for help she asked for money and he said he was banking on her curiosity to get to her and he just waited. Every moment since then just solidified my love of their relationship. I really wish his job at mars investigations had worked out though. He was actually good at it.