It must be an age-old conundrum for practiced martial artists. Even adults brag on their karate skills, but lack the ability to show it. Traditional martial artists consistently build character and that should be apparent in their behavior of striving for respect, self-control and confidence even if they never show you their fighting or defense moves.
For my first two classroom readings of my character building book I went to two separate kindergarten classrooms where I knew none of the kids and only one of the teachers. That’s where I introduced character concepts through my fictional karate story.