Ok so, I was rewatching a few G1 episodes, and Moonracer caught my attention. This is my description of her personality, but I want to make sure I haven't misinterpreted anything.
So, Moonracer wants to prove herself, which sometimes causes her to not think very far into the details of her actions. But, she is able to take responsibility. When she does mess up, she takes it to heart. She is very resourceful, and is intelligent. She cares deeply about those around her. She is on the younger side, and prefers actions over standing around. She is very skilled, and knows it. This, combined with her other personality traits, just adds to her being a bit too, not impulsive but she doesn't really think very far into why rules are there. She is, over all, a very happy and energetic person. Don't let her fool you, her confidence is warranted.