My six year old twins will be participating in Book Week next week and my son wants to go as Zac Power, so I created some Zac Power I.D. Badges as I could not find any reasonable quality ones online. There was reference to an old one from a now decommissioned web site for Zac Power, but it was really low resolution and badly pixelated.
Feel free to download and use these for your kids if you so desire. I used Affinity Designer by Serif