Gwen / Sirius
Gwen was likewise a fantastic friend. She was fun and funny and she always was willing to go on adventures. Plus she explained stuff about muggle things he'd never seen before and was always patient about it. Which was pretty brilliant. 10/10, would friend again.
And oh, that wasn't even bringing into account the fact that she'd just brought him food. Secret muggle food that was fried and, evidently, on a stick. Which was just great. Really great. What a delight.
"You have no idea how excited I am," he said with a grin, although he turned around so that everyone could keep not looking at him because it was very true, Corn-Dogs were not on the approved food list. Weird orange chips were, and wasn't that enough?