Quicksand:

Biographical Data:
Real name: Sae Quan Yat (note: I made this name up for her)
Other current/former aliases: None
Dual Identity: Known to the authorities
Current occupation: Adventurer
Former occupation: Assassin, criminal
Citizenship: Expatriated citizen of North Korea
Legal status: Convicted of numerous crimes, which she has been sentenced to spending the rest of her life working for the government in some fashion.
Place of birth: An unnamed town in North Korea
Known relatives: Sae Jong King (ancestor)
Known confidants: Group X (Former) Seth, Mongoose
Known allies: Group X (former) Seth, Mongoose
Major enemies: The Army (Former) Thor, Thunderstrike
Usual base of operations: Group X headquarters, Fort Worth, Texas.
Former base of operations: Mobile
Current group membership: Group X
Former group membership: Ally of Mongoose, employee of Seth
Extent of education: High school graduate

Physical description:
Height: (as Quan) 5� 4" (as Quicksand) 6�8"
Weight: (as Quan) 100 lbs. (as Quicksand) 500 lbs.
Eyes: (as Quan) Dark brown (as Quicksand) Yellowish brown
Hair: (as Quan) Black (as Quicksand) Yellowish brown
Other distinguishing features: (as Quan) None (as Quicksand) She is composed of a malleable sand-like substance

Powers and abilities:
Intelligence: Normal
Strength: (as Quan) Normal (as Quicksand) Superhuman class 90.
Speed: (as Quan) Normal (as Quicksand) Enhanced human
Stamina: (as Quan) Normal (as Quicksand) Enhanced human
Durability: (as Quan) Normal (as Quicksand) Demi-godlike
Agility: (as Quan) Normal (as Quicksand) Metahuman
Reflexes: (as Quan) Normal (as Quicksand) Metahuman
Fighting skills: Fair hand-to-hand combatant, usually relies on superhuman powers
Special skills and abilities: Knowledgeable in atomic radiation.
Superhuman physical powers: Aside from the above, Quicksand can transform herself into a malleable sand-like substance which can be hardened, dispersed, or shaped according to her will. She can increase size and mass provided there is sand, which she can take in. The limits of this are unknown.
Known superhuman mental powers: none
Special limitations: As Quan she detests fighting, and tries to avoid becoming Quicksand. Formerly unable to initiate the transformation from Quan to Quicksand and back.
Source of superhuman powers: Atomic radiation

Paraphernalia:
Costume specifications: Unstable molecular fabric
Personal/Special weaponry: none
Other accessories: None.
Transportation: Access to Group X vehicles
Design and manufacture of paraphernalia: (vehicles) Reza El-Muhammed (rest) Unrevealed

Bibliography:
First appearance: The Mighty Thor #391
Origin issue: I might write one someday..
Note: Quicksand apparently died in Thunderstrike #22. In my continuity, Seth resurrected her, but then she betrayed him.

Quicksand has been resurrected in Thunderbolts.
Also, Quicksand was originally created by Tom Defalco and Ron Frenz.