I can't choose between him and Sirius, but he's definitely one of my favorites. His life is so sad, I just want to give him a great big hug!
4laugh Being the last marauder, seeing all his friends die, being a werewolf, and being forced to marriage by Tonks, though it clearly contradicted his gay self would surely put a strain on anyone. But he's still adorable despite his premature wrinkles and graying hair. ^_^
Plus, having his beloved Sirius in Azkaban for 12 years while he wondered the whole while if their relationship was a LIE? Gah, he needs a break.

They're just so adorable. :]
Credit for the image goes to someone on Deviant art. I can't find the link, Sorry! D: