These are so cute! <3 Paired with the nametag holders that have holes for these characters' pegs to connect to, it's an amazing way to introduce yourself without a word. :) Once you pop out the characters, they will be tiny and loose pieces of plastic, so be careful if they roll away on the floor!
The colors matching the name tag may be slightly harder to read from a distance because they can have a semi-camouflaged effect. Consider a differing hiragana text color to contrast your name badge for maximum visibility from afar.