What % of furrys do you think are just attention-seekers?
The same percent of general people who are. I don't see why furries would be any more special in this regard; they reflect common human statistics for stuff like this, I'd imagine. I don't think there are really any people who are furry to get attention, but I'm quite certain there are attention-seekers who happen to also be furry. We do have quite a few drama llamas in our fandom.
Do you think furries will ever be more accepted than they currently are?
Of course. Acceptance happens eventually once people get used to something... unless if it's say, really abhorrent, like murder. I think that as bizarre as some - well, okay,
a lot - of us are, we're not really abhorrent. Most furs are pretty nice people from all I've seen, and would not react any differently than any other human in an everyday situation: we hate school, we hate work, etc. etc.
An interesting idea; you propose, if I understand correctly, that furry fandom is defined entirely by subscription? I suppose that makes a certain sense. However, would you rely entirely on known self-identification when referring to others as "furries"? Or are there certain conditions which would allow you to feel comfortable presuming such identification?
I define furries by fulfilling two criteria, if I have to put it in terms: a) some degree of interest in anthro animals, and of course, b) self-identification as a fur. The degree of interest can vary, but in my case, it's a slight slant in favor of furs whenever I see them. If lacking self-identification, I'd say common interest in the fandom(registering in it, contributing artwork and stories to it, etc.) could also suffice as a fur in all but name.
To give an example of my "fur bias".. I hate to invoke that fangirl-ridden piece called Twilight, but when I was forced at gunpoint to go see New Moon, I automatically chose the Werewolf over the vampire. Simply based on sight. Why? Because he was a were
wolf. Automatic victory.
..Does that make me racist?

Or... "speciesist"?
Also, how does the use of "furry" in relation to fans relate to it's use in reference to characters? Presumably, the creation of the latter does not imply membership of the former?
Oh no, by no means. "Furry characters" is a term that can be applied to anthro animals, but I wouldn't say that Walt Disney was a furry, nor would I say Naoto Oshima(creator of Sonic) is either.
A fair point. I suppose what throws me off is that the typical fursuit seems to diverge so strongly from the aesthetic usually encountered in anthro artwork that it seems almost alien. Is there any particular reason why so many fursuiters seem to favour the bulky "mascot" style of costume over the more aesthetically coherent style which uses a mask and a tighter suit or clothing? Is it simply because the former can be bought off the rack more easily, or something else?
I really have no idea, having not really fursuited myself. Your theory would make sense - i.e. it's easier to have it made. The bulkyness could also result from the fact there's more room for fur and stuff to be added, adding to the illusion that one has truly become an animal... which I assume many fursuiters try to have.
Nothing quite like suffocating under a pelt to replicate that, I guess.