User blog comment:B214/DxD Queen tournament/@comment-1359322-20141225110854/@comment-4320546-20141227235958

I'm with B214 on this one. Also, didn't Rias say that pre-Riser fight? With all the stuff that's there's not really much time to do any of the sort, and even when they do, it's not like Rias is deliberately trying to protect it (though she's not deliberately trying to lose it either, of course, besides the stint in Volume 2). Also to be brought in consideration is the crap as publishers of Fujimi Shobo who are the ultimate cockblockers to the series. Because of them, Ishibumi has to provide some sort of cockblock on Issei. But having Asia so the the majority of them since the third Volume is an easy way to make her less likable.

On the subject of her personality, I'll agree with what anon said for his description, but only on that. That's because that kind of personality is already old to Harem series in general, though that's not the only reason. Compare Asia's personality to everyone else in the series. Everyone has a personality that is vibrant, diverse, and with quirks that set them apart from other characters with similar personalities, even the villains and extremely minor characters, with the exception of about a handful, and even then that number doesn't even pass ten.

Unfortunately, Asia doesn't have a personality like that. Sure you could argue that many other characters were like that with their own bland personality when they were first introduced, and I would agree with you. However, when that personality persists with little to no development over the course of 19 Volumes and dozens of short stories, there's only so much you can do before you get bored with that personality and thus the rest of the character as well.

Take it or leave it, that's how it is.