[Mayuko thinks a moment, then holds up her hand and makes a gap between a thumb and an index finger for measurement.]

Just a little metal star-- it wouldn't look out of place on one of those charm bracelets, where the trinklets clip on? Even looped and tied over a watchband, or through a hole if it's leather. "Close to the hands" is better, I was told.

And I hope it tamps down on the muggings-- I didn't receive it specifically for him, but as I thought it over, I decided he needs it more. It's a mix of intimidation-aura to ward off attacks, and... some slight defense if one is attacked.