Sometimes this 'character' is abusive to children. When in an abusive environment, a healthy child is not appreciated. They are uncooperative with people who would hurt them. This means that if you have a relative who is a 'character', your child might cry and raise a real ruckus. Depending upon your family system, this can become a real problem for you and your child.
Healthy children learn age appropriate limits.
They instinctively know the difference between boundaries and abuse. Boundaries mean you love them enough to protect them and make them safe in the world. A strong and loved child might test the family limits, but doesn't fall apart when they are firm. Healthy children are able to ask their parents for help when they need it. They'll come to you when they need you.