I first started liking the Backstreet Boys during the US Backstreet Boys era. At that time Brian was my favorite Backstreet Boy because he was the cute, funny one - totally my type. My favorite song used to be As Long as You Love Me but now I love Don't Wanna Lose You Now. Since becoming a fan, I have seen the guys on tour 17 times. My favorite tour was In a World Like This because KEVIN!!! Also good seats, good friends, VIP, old-school dancing, and amazing new songs! The one song I wish they would perform in concert is One Phone Call and take out I'll Never Break Your Heart.
Nowadays, my favorite Backstreet Boy is still Brian because he's still cute and funny, and I admire his strength of character. I have to admit, at first I didn't think much of Nick but now he's really grown on me. I still don't give [name of a BSB] much thought because I just don't have all that much interest in him or anything in common with him. I used to not care much about Howie or Kevin, but I love them both now! If Brian or Nick were to leave the band, there is no way it could continue on as a foursome, but if I had to pick one of them to leave, I would choose no one because losing Kevin was hard enough, and now that he's back, I can't imagine anyone ever leaving again. (But if I really HAD to pick, I guess I'd pick Howie because the songs would be affected the least, and I'm too grateful for Kevin to pick him.)
The one thing I love most about these boys is their personalities and how they mesh together. But if I could ask them to change one thing it would be not to indulge obnoxious fans with special attention (tweets, shoes, etc.).
At the end of the day, we're all fans but the one thing that bugs me most about this fandom in general is all the complaining - despite how hard the Boys work to please their fans, some fans are never happy!. I think Nick is the most fan friendly where Brian needs the most work. Regardless, I love these guys and will remain a fan forever unless the world ends, in which case I will hopefully continue being a fan in the afterlife.