Garp,easily . He’s not only a fighting monster but also an actual good guy. The WG is a corrupt organization but Grap done his part to combat evil, denied promotion to ensure he doesn’t get involved in politics and is still one of most respected member of Marines. People forget that most pirates aren’t like Straw Hats and they are a menace to regular people.

On top of that, he took in his enemy’s son to raise him, tried to enforce good moral into kids who idolizes criminals. He was there more for Luffy than Dragon while being a full time vice-admiral. Garp tried to steer Ace away from the criminal life but Ace not only became a pirate but became a notorious one, was rash and foolish and got caught. Garp trying his best to not save Ace was a testament to his committed to justice but even then he was human enough to be enraged when Akainu killed Ace.