It's still an issue of who in the hell wants massive jingle bells going off right above their ears all the frickin' time, yanno?
Well, to defend CLAMP, the people who invented that jingly bell hair, the character is a robot-thing and wouldn't care.
I'm not saying it's not ridiculous, because it is. At least it's not one of her pay items. And I still don't get why it ever needed recolors other than black, dark blue and elder gray.