Well I love all of them but Aiba is my second favorite most of the time, my favorite being Ohno/Riida. The funny thing is I had actually seen Aiba in a drama a year before knowing about Arashi, it took me a bit after becoming an Arashi fan to remember that I had seen him in a drama before
It went great! I got within eight feet of Aiba-chan and MatsuJun, the music was great, got to talk to lots of fans, each member waved at the audience section I was at...it was all a blast ^_^
Random thing I remembered and should tell you before I forget it again!
Gack was totally the last boss in a Gundam videogame, weaponized guitar and everything.