A character trait is basically the personality of someone. For example my character trait can be generous.
Yes, any personality trait is a character trait.
No it isn't a character trait.
no. special is not a character trait. you can say that the character is special.
Yes, it is a character trait.
Yes, isolated can be a character trait.
Yes, it may be a character trait.
Yes, hopeful is a character trait.
Impulsiveness is not a character trait. Being impulsive would be classified as a personality trait.
A character trait is ANYTHING about the character. You can't make a list of all of them.
Yes, anything that describes the character's personality or appearance is a character trait.
A character trait that means worried would be concerned.