Sirius Black
"What are we going to do, Remus?" Sirius asked.
"What?" Remus blinked. "What do you mean 'what are we going to do?' What's done is done. Harry is still alive and well, so Hagrid didn't fuck up and all is well. What more do you want?"
"He's my Godson," Sirius said. "He's a wizard. If he's not with Alice or Augusta, then he belongs with me. With us. Not Petunia. Come on. Let's go get him back."
"Hold up." Remus said a hand. His hangover was making it difficult to think but he still knew how logic and the law worked. "On what basis?"
"What? What do you mean 'on what basis'?"
"He's with his last living relatives," Remus explained slowly. "You can't just 'go get him'. He belongs there, legally. Not with us. I'm a werewolf and you might be his Godfather, but chain of custody is pretty clear. Being muggle doesn't take them out of it or give you higher priority."
"That's not how the Wizengamot is going to see it," Sirius smirked.
"That is exactly the sort of thing we were fighting Voldemort for!" Remus snapped. "Are you listening to yourself, Sirius?"
"Harry is my Godson!"
"And he is with Petunia for a good, legal reason!" Remus snarled. They stared at each other for a long while before Remus sighed. "Look, why don't we go talk to Dumbledore and see what we can do?"
"Dumbledore is the reason I was on trial in the first place," Sirius countered. Remus wanted to say it was because Sirius tried to attempt murder and was so bad at it that he got innocent bystanders killed. But he made himself calm down. He had to make Sirius to see sense.
"Fine." Remus sighed again. "McGonagall then."
Sirius nodded.