Lucas or Brooke!

^^^ I agree. I'm choosing Lucas because he has spent a lot of time supporting both Nathan and Haley during the hard times in their relationship and helping them make amends. But Brooke has mentioned many times how she sees Nathan & Haley's relationship as the ideal relationship. There are so many times when she says they are the most stable and secure couple and says how they make her believe in true love. And in season 3 she was constantly trying to help them get back together.

In season 1 Peyton seemed to be a big Naley supporter also. Not that she wasn't in other seasons as well... but we don't hear her talk about Nathan & Haley as a couple in the other seasons as much as we do in the first season (I mean she even paints N + H with a heart around it on her closet door- or bedroom wall?-... or maybe it was H + N? either way, you guys get my point).

Lucas by far! But also Peyton and Brooke

Brooke and Lucas.

I think Lucas tho its ironic that at first he didn't agree with Haley dating Nathan at all.

brooke did so many things for them :) some examples:

s1:
-made NH date and brought US their first kiss :D
s2:
-organized the party in 2x02,even if she wasn't so sure about NH,she still supported them!
s3:
-made Nathan come to the party 2 show that he still cares[3x04]
-gave them back their house (appartment) keys
- 3x21 ?! don't need 2 say more here :)
s4:
-the whole pregnancy thing !
s5:
-took care of Jamie lots of times
and so on ^^ :D

Even though Lucas would be my top pick it's just that Brook is still right there with them!!! She's a true friend to both of them maybe Haley more but she's there for them!!

Lucas and Brooke.<3

She's still there for them !

Definitely. Lucas had his doubts about NH quite a few times but Brooke was always a supporter! =D