I remember him from the fourth book, and how he kept trying to help Harry win because he was betting on Harry to win money to pay off the goblins. What I don't remember is what ended up happening to him during the war, did he die?
Of course I remember Ludo Bagman! I've always had a soft spot for him.
I don't think he is mentioned at all past GoF. He goes on the run after he looses the a bett that Harry would win the Triwizard Tournament (because Harry and Cedric both tied, Harry did not technically win). Last I remember he was in hiding from the goblins.
I didn't realize the movies omitted him (I haven't seen 4, 5, 6). Just another reason I hate the movies so much.
Yes, he went on the run from the Goblins in GoF over bad gambling debts, and I do not believe we hear about him again after that.
And he was, apparently, never actually close to the Death Eaters...he did go on trial for passing information to them, but he claimed to have thought he was working for the good side, and he was both a famous Quidditch star with great charisma and not particularly bright so, much to Crouch's disgust, the jurors laughed along with him and let him off the hook with barely a chastisement.
To the larger point: I love minor characters. They're what really makes a story good. A world where only the main characters are given personality and histories is a world that, to me, always feels empty. The best stories are those where everyone matters to someone, no matter how crucial or passing their role in the story itself is. One of the reasons why HP is so good, and one of the things I'm really hoping to see more of on Pottermore. I want to know all the details, please!
I always seem to group Horace Slughorn with Ludo Bagman. Older men, living a comfortable life with lots of influence. Well, until they went into hiding. But he was really a great guy, beneath his gambling troubles. He got the Weasleys seats in the box at the World Cup. At a time that Arthur Weasley seems widely ridiculed for his interest in muggle contraptions. At a time when no one paid heed to what ever trouble muggles got themselves into. Arthur Weasley was head of a two man department (Or is that later in the books? Oh well). Bagman chose to give him box seats. That's the difference between Horace and Ludo, Horace would give the seats to someone who would launch him forward. Ludo gives it to whoever he wants.
"It doesn't matter that Harry's gone. People die everyday... friends... family... Yeah, we lost Harry tonight. But he's still with us, in here. So is Fred, Remus, Tonks... all of them! They didn't die in vain! But you will, 'cause you're wrong! Harry's heart did beat for us, for all of us! It's not over!" -Neville
I always think of Ludo as jovially-selfish, but he did go out of his way to do Arthur a favor without any expectation of reward, didn't he? I mean sure, he gets to show-off -- but considering that all he does is show-off, really, I don't think he had to go out of his way to do that. And it was a pretty big favor, too; it's not like he just got Arthur two tickets, no, he gets them for the whole family. And that's quite a family!
(Sure, he then screws-over the twins when his gambling debts go bad...which brings us back to the selfish aspect...but he clearly still likes to do nice things for people, just not at his own expense.)