Fred, hands down on that. I love the twins, I actually don't think I would have liked Fred character if it hadn't had a twin, but I honestly prefer Fred for his name, if it does make any sense
The name "Fred" actually means Peace Ruler. And I dunno, I wouldn't say that the whole "fireworks" scene was peaceful.... Haha. Actually, when was anything the twins did peaceful? Hahaha. <3 But I see what you mean.
I love them all so much... But I have to say Ginny. Book Ginny is so often undervalued. She's such an amazing character! I feel like she has the best qualities of the trio. She's particularly good at casting spells (Hermione), she's always joking around (Ron), and she's extremely brave (Harry).