Personality. Percy is good-natured, friendly, brave, and willing to risk his life to save his friends, strangers, and even his enemies. He is angered by Thalia Grace because their personalities are similar, they argue even though they are good friends. Percy has a sarcastic sense of humor and is funny in his writing.
Hope this helps :)
Have a great day!
D: Jo is independent
Since it says that Jo is strong, wild, and happy all alone. I can only conclude that Beth is calling Jo Independent.
To get a good career in the future