Get Character Controllers to ignore other Character Controllers

Hi. I have two GameObjects (gumbas!) that are being controlled by Character Controllers. I am trying to get the gumbas to completely ignore each other. There are a couple of colliders that are already being ignored using Physics.IgnoreCollision() and that works great. However I cannot seem to get the two gumbas Character Controllers to ignore hitting each other. Is there some way to access the controllers colliders? Or do I need to find a new way to move my little enemies.

Assign them to a new Layer. Then go to Edit > Project Settings > Physics, and turn off the checkBox, where the names of that layer cross. This way they will ignore each other…