Meh. I thought you were a blonde for some reason. xD
My hair color is blonde actually. Some people are suprised by that... Anyways, what would I do with Ultima Weapon? Shave off my English teacher's mustache.
Oh my gosh where do I begin? well, if I had the Ultimate Keyblade I would hack and slash every heartless/nobody in the cozmos, show it off :laugh, and all the other cool thing you could do when your in charge.
I use it to open my brother's car door so I can drive his car without getting lectured for 15 minutes on safe driving (his car is a Lancer Evo 8). Or I go beat up my brother for breaking my X-box 360.
I think I would probably break some of that crap that always sticks off in weird angles. I'd be trying to smuggle it into the mall in my pocket and some bits would break off...
Not to mention, it would be really pointy if it brushed up against your leg or something.