Tim Drake / Robin (III)

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Age: around 15
Height: 5'1"
Weight: 115 lbs 
Eyes: Blue
Hair: Black
Marital Status: Dating Stephanie Brown (The Spoiler)
Occupation: Vigilante, Student
Base of Operations: Gotham City and State
Group Affiliations: Young Justice
Current Status: Active vigilante, Leader of YJ
Relations: Father Jack Drake, Deceased Mother Janet Drake
First Appearance: Batman #457 (December 1990)
Ability's: Tim has no superpowers but none the less has many talents. He is a first rate hacker, a master Detective and Tactician, an excellent Martial Artist, and a great acrobat. He is armed with a expandable Bo Staff as well as other equipment.
Profile: Mature beyond his years, level headed, a natural born leader, and a good judge of the best course of action.
Dick Grayson (Robin I) became Nightwing, and Jason Todd (Robin II) died at the Joker's hands.


Kon-El / alias Karl Krummett / Superboy

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Age: 2 years living but matured to 16, may never age more
Height: 5'7"
Weight: 130 lbs
Eyes: Blue
Hair: Black
 Marital Status: Single
Occupation: Adventurer, Field Agent for Project Cadmus
Base of Operations: Global
First Appearance: Adventures of Superman #500 (June, 1993
Group Affiliations: Young Justice, former member of the Justice League, the Ravers, and the Legion of Super-Heroes
Current Status: Active super hero in YJ and a Cadmus field agent
Relations: - DNA Donor Paul Westfield, (Deceased Director of Cadmus Project), DNA restructured from Roxy Leech's pattern
Ability's: Project Cadmus created Superboy as a near-identical clone of Superman. His powers are of "Tactile Telekinesis", which is equivalent to and simulates Superman's powers. Through mental concentration Superboy can manipulate objects, disrupt mechanics and fly. Super Speed is another one of Superboy's assents. He can also protect himself and others by putting up a TK field. Superboy shares Superman's weakness to Kryptonite and may also be a living solar battery, just as Superman is.
Profile: Reckless but has matured recently. He is also arrogant, a bit impulsive, a born leader, and a ladies man. Superboy is now content to be a hero in his own right rather than replacing Superman.


Bart Allen / Impulse

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Age: Chronologically, 2; Virtually, 19; Physically, 8, Mentally, 14
Height: 5'1"
Weight: 110 lbs
Hair: Brown
Eyes: Yellow
 Marital Status: Single
Occupation: Apprentice hero, Student at Manchester High School 
Base of Operations: Manchester, Alabama
Group Affiliations: Young Justice, former member of The New Titans and The Teen Titans
Current Status: active in fight against crime with YJ and his speedster buddy's
Relations: Mother Melonie Thawne (30th Century), Father, a Tornado Twin, Grandfather Barry Allen (2nd Flash, deceased), Grandmother Iris West Allen, Second Cousin Wally West (3rd Flash), "uncle" Max Mercury (Impulse's trainer)
First Appearance: Flash #91 (June, 1994)
Ability's: Super speed is Bart's super power. He has reached speeds Wally West couldn't approach at his age. His top speed appears to be that of light, his fast metabolism helps him heal quickly, he can also vibrate his molecules so that he can phase through solid objects.
Profile: Immature, reckless, never thinks before he acts and has no grasp of mortality. Probably due to the fact that he spent most of his life in VR (Virtual Reality).


Secret / Subject 2TDNll

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Age: around 13
Height: 4'8"
Weight: N/A
Eyes: Blue
Hair: Light Brown
Marital Status: Single

Occupation: Unknown

Group Affiliations: Young Justice

Base of Operations: Happy Harbor, Rhode Island
Current Status: Member of YJ, Fugitive of the DEO (Department of Extranormal Operations) project Smoke/Mirror
Relations: Evil older brother Harm, DEO Dr. Andrew Charles

First Appearance: The Secret #1, (June 1998)
Ability's: Secret's body is made up of a gaseous substance which allows her to squeeze through hairline cracks, change shape at will, smoke jump (teleport), solidify for only a few minutes at a time, and teleport objects into the abyss.
Profile: Pretty naive since she's been locked up by the DEO and hasn't been in the real world.


Cissie King-Jones / Arrowette

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Age: around 14
Height: 5'7
Weight: 107 lbs
Eyes: Blue
Hair: Blond
Marital Status: Single although there are some sparks between her and Bart, and Superboy is just plain crazy about her.
Occupation: Student at Elias School
Base of Operations: Western Pennsylvania
Group Affiliations: Young Justice
Current Status: Quit being a member of YJ after nearly killing the murderer of her good friend Marcy Money (Superboy stopped her). She is now back with her mother (who got a clean bill of mental health) and is now a member of the U.S. Archery Team
Family: Mother & Olympic Archery medalist Bonnie King / Miss Arrowette, Father Bernell Jones / Bowstring, (deceased)
First Appearance: Impulse #28 (August, 1997)
Ability's: Cissie has gained her status as an extremely competent archer due to the tough training she received from her mother since she was a child. She prefers to use trick arrows.
Profile: Cissie is a particularly troubled teen who is now trying to achieve a normal life.


Cassie Sandsmark / Wonder Gir

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Age: around 14
Height: 5'1"
Weight: 90 lbs
Hair: Blonde (Cassie), Black (Wonder Girl)
Eyes: Blue
Marital Status: Single
Occupation: Novice hero
Group Affiliations: Young Justice
Base of Operations: Gateway City
Current Status: The Current Wondergirl
Relations: Mother
 First Appearance: Wonder Woman #111 (July, 1996)
Ability's: Cassie's super powers are super strength (2nd to Superboy) and flight, both granted to her by Zeus because of her heroics while Mercury's boots (flight), and Hercules' bracelets (super strength) were in her possession. She is also very fast.
Profile: Headstrong yet Humble.


Stephanie Brown / Spoiler

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Age: around 15
Height: 5' 5"
Weight: 110 lbs
Eyes: Blue
Hair: Blond
Marital Status: Dating Tim Drake (Robin), only she only knows him as Robin
Occupation: Vigilante, Student
Base of Operations: Gotham City and State
Group Affiliations: None
Current Status: Becoming an active vigilante again after recovering from her pregnacy (gave child up for adoption, no it's not Robin's kid)
Relations: Mother , Criminal Father Arthur Brown / Cluemaster, (reason she became a vigilanty).
First Appearance: Detective Comics #647
Ability's: Steph has no super powers and has received no special training aside from Gymnastics and other fine tuned natural skills. She is learning a bit of detective work through her few team-ups with Robin. She can be helpful even though she's pretty inexperienced and danger-prone.
Profile: Mature beyond her years, her harsh life has made her that way.

Much of the info here was taken from Young Justice Secret Origins 80-Page Giant # 1, as well as my own observations on the character.