Relena- Relena made the fatal mistake of getting in Heero's way during one of his missions.  He tried to kill her until she found out that she was the princess of a lost kingdom.  She is a pacifist, and towards the end of the series, her and Heero start to fall in love with each other.

Trowa- Trowa is from one of the space colonies.  Trowa is one of the most quiet pilot and has never been heard to laugh.  He hides out at a circus where has knives thrown at him by Catherine. 

Wufei- Wufei is part of a marital arts temple in outer space.  He hates weak people and can't stand being weaker than anyone else.  He also doesn't believe is women doing anything a man does.

Duo- Duo is one of the happiest pilots.  He is known for his long braid and spends his time working at his parts shop.  He is the most talkative and is often thought as annoying by Heero.

Quatre- Quatre is one of the kindest pilots.  From the Arabian deserts, and descendent of royalty, he is surprisingly kind and gentle and doesn't like confrontations. 

Zechs- He is Relena's brother although she doesn't know it at the beginning.  He fights on both sides, but is always Heero's enemy.

Treize- Treize is the count of the OZ foundation.  His heart is always in the right place, however.  He is Wufei's enemy through out the series.

Lady Une- Lady Une is Treize's second in command.  She suffers from split personalities.  One of them is a kind pacifist, while the other is a cruel colonel.