Valiant isn't a pseudonym... She was named for the car she was born in the back seat of, which probably tells you as much as you need to know about her family. Valiant isn't immediately likable, some would argue that she's not actually likable after being considered close friends for a number of years. She will always be the one to step into danger or speak out if anything was morally reprehensible. However, the strict moral code she keeps is all her own, and frustratingly complicated for anyone else to unpick. People would say she is on the spectrum, but when pressed, fail to say where, or even define exactly what spectrum they were talking about. Elusive, blunt, and literal... Most people would give up trying to start a conversation very quickly, and even her friends would find it difficult. But in spite of her many quirks, or perhaps because of them, she was much loved by everyone that claimed to know her, even though (as it was described by a friend.) "...it was like falling in love with the Sun... her brilliant light illuminated the whole world, but if you get too close, you'll burn up."
Also... Valiant has a time machine.