“A fascinating question, but one that's not the easiest to answer. The more you change along one axis, the less you'll change along another, but you can get more total changes from a bunch of small things than from one big one; someone who changes their face shape and hairstyle and height all just a little will tend to look more different than someone who just gets taller, especially if you also consider non physical factors like posture and expression. Fundamentally, it's not really designed to have one gigai end up unrecognizable though, so you're not going to get more than a few inches in any measurement except hair."

She contemplates for a moment, and then nods. "Yeah, I think I see how we'll all fit into that. We can get a lot done with hair color, length, and eye color. Little bitty changes to everything else are plenty."

"So what sort of measurements do you need to take?"

"Oh you know, the usual. Reishi distribution, Reiryoku color pattern, reishi-kishi harmonics, psychospacial equilibrium, frabjus quintessence, Bluetooth connectivity..."

As he speaks, he goes through an array of handheld devices, starting with one that wouldn't look particularly out of place scanning barcodes at a grocery store and picking up steadily more bizzare modules from there.

Her expression starts off curious and interested, but becomes increasingly skeptical. "Were you feeling particularly fond of mortal poetry when you named 'frabjus quintessence'? And 'bluetooth connectivity', seriously?", she asks him, amused.

"You'll be happy to learn that I have confirmed you are entirely unconnected to bluetooth! Anyway, now I'm going to need you to stay patient while I finish editing this gigai to the proper specifications."

He pauses for a second.

"And we're done! Don't mind the appearance, it looks like that for everyone until someone's used it."