It’s basically using no formal rules at all, since only my oldest can barely read and I don’t expect them to actually stick to any rules anyway. Their rule set is merely that they have to stick to a set of 3 specific powers. And they can’t even stick to that. lol.

My daughter chose 1) wand that conjured toys and candy 2) a flying unicorn mount 3) magic singing voice

My son chose 1) super strength 2) button that turns him into giant animals 3) dragon mount.

The mounts were forgotten. The only one that has stayed consistent is my son’s transformation button. lol. We have fun though. I’ll introduce them to DC20 in maybe 5 years.

Now my weekly party with adults is DC20 and they are set in a Roman era setting where the dwarves are the Germanic people’s, the Faye are the celts, elves are the Greeks, the gnomes are the Slavs, and the orcs are the Huns. My players are having fun with the NPC names like “pompous coitus” and “Gaius testiculatos” for adversarial politicians too.