I've said before, crossing the Buffyverse with the Potterverse is fraught with difficulty, not least because the ridiculous aspects of both combine to a kind of critical mass far too quickly.
I've written a couple HP/BtVS crossovers before and I disagree (though I'm also not sure what you mean by "the ridiculous aspects combine to a kind of critical mass," so maybe that's it). I think you have to be careful and account for differences in the universes, of course, particularly re: magic, but IMNSHO the point of crossover is not to make the worlds mesh perfectly - this is usually not possible, though there are exceptions, mostly canons that are purely RL with no supernatural element, like House. For me, rather, the point is to get the two universes in dialogue with each other; if I have to ask my reader to suspend some disbelief in order to achieve then, well, we are all here to read fiction, aren't we? I think that people who read/write crossovers understand that even better than most.
Which is not to say that it isn't fun trying to get the worlds to mesh. I spent a bit of time addressing the issue of magic in both my Remus/Giles fic and my Hermione/Willow fic and I like what I came up with well enough. But that wasn't the point of either of those stories - the point was that I wanted those two characters in a room together so that they could talk and the canons could talk. Sure, there are points of intersection that aren't 100% sensible, but, frankly, who cares?
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I've written a couple HP/BtVS crossovers before and I disagree (though I'm also not sure what you mean by "the ridiculous aspects combine to a kind of critical mass," so maybe that's it). I think you have to be careful and account for differences in the universes, of course, particularly re: magic, but IMNSHO the point of crossover is not to make the worlds mesh perfectly - this is usually not possible, though there are exceptions, mostly canons that are purely RL with no supernatural element, like House. For me, rather, the point is to get the two universes in dialogue with each other; if I have to ask my reader to suspend some disbelief in order to achieve then, well, we are all here to read fiction, aren't we? I think that people who read/write crossovers understand that even better than most.
Which is not to say that it isn't fun trying to get the worlds to mesh. I spent a bit of time addressing the issue of magic in both my Remus/Giles fic and my Hermione/Willow fic and I like what I came up with well enough. But that wasn't the point of either of those stories - the point was that I wanted those two characters in a room together so that they could talk and the canons could talk. Sure, there are points of intersection that aren't 100% sensible, but, frankly, who cares?