(Yes, I know, catchy title.) But anywho, you can use my mini's as an example.

Name: Ichiya Juuichi
Age: 27
Gender: Female
Rank: Crested Jonin
Appearance:

History: Was trained and raised by her older brother, Jasper, both of her parents having died when she was young. She was trained in medical ninjutsu under Serenity of the Crested, and went on to be a jonin soon after completing her training.
Personality: She's very rash and mouthy, taking orders from no one and giving orders to everyone. She can be a good friend once you get to know her.

Name: Jasper Juuichi
Age: 37
Gender: Male
Rank: Crested Jonin
Appearance:

History: Jasper's dad was killed early on in his life during a mission that supposedly went wrong. He's trained himself to his limits and it one of the finer ninja of the Crested. His main attribute is his kekkai genkai, which is a split personality that's more agressive and stronger by far. His element is ice.
Personality: Jasper is a kind person, after the affections of a certain lady in the Crested. Or, he was, before he was shut down. He's very vengeful when one of his loved ones is hurt, and has something of a rivalry going on with Felix Kuriyama. (Oh yeah, and he's a bit of a psycho when he's using his split personality, named Boreas)

(More to come)