I have to admit I've neither read V for Vendetta nor seen the movie, and that one is at least set in Britain and concerning Britain, but I've no idea about the style or production method (role of the artists, bolded words, that kind of thing).

And no, there's a disproportionate amount that's Belgian (or at least adopted Belgians - some are foreigners, like Rosinski, who have come to live and work in Belgium), but there are a good number that are French too. Uderzo and Goscinny (of Asterix fame) are French, Möbius is French, Jacques Martin (author of Ale, Roger Leloup (author of Yoko Tsuno, the series I recommended to Ghav above), and so on. As for why there are so many that are Belgian, the Franco-Belgian comic book world is a fairly small one... there were three big magazines (Tintin, Spirou, Pilote - the former two Belgian, the latter French) in which most of the famous authors and series were published at some point. And many of the big names were taught by others - many of Hergé's students became big names themselves, and taught others in turn. And obviously most of Hergé's students were Belgians.

The main reason why the writers are so disproportionately Belgian, though, is quite simply that the readers are as well. Things have perhaps changed now with the increasing influence of American pop culture on the one hand and the manga invasion on the other, but we used to read much more comics than any other country, including France, and almost exclusively Franco-Belgian ones at that. There are a few Belgian creations like Tintin and the Smurfs (and the French creation Asteri that have more or less conquered the Western world, but most others had much more limited international success, other than in the Francophone world (or, in the case of some of the less numerous Flemish comics, in the Netherlands).