Blackjack is a two-person team of agents with G.R.A.M.P.A.
In fact, this entry in the compendium is really two in that not only does it deal with the two people who make up Blackjack, it also deals in a degree with the organization itself. One of the entries listed below deals solely with places in which GRAMPA is mentioned.
The breakdown of the very odd acronym, seen both with and without the periods in the name, is the "Global Reaction Agency for Mysterious Paranormal Activity". We are told from one of our sources that "little is known of" it other than "it maintains a few field agents all over the world, who occupy themselves with saving the world. The group is known to world governments, but may not be respected: on one occasion, a member of the Japanese SDF regarded two agents of G.R.A.M.P.A. as a deadlier threat that of Terminus himself." This relative anonymity extends to some pretty "in the know" world-savers in the Marvel universe, such as Henry Pym, founding member of the Avengers. Pym had been around the block quite a few times and likely knew of every organization that existed but even he is a bit perplexed when he meets Blackjack and is told he could temporarily work under the GRAMPA umbrella (or perhaps it was just having to be associated with such a name that got to him).
What little we do know of GRAMPA is that it seems to have access to some pretty amazing gadgets and awesome toys though some of them may just be replicas to intimidate opponents - as in, "oh, no! That GRAMPA agent as the Super Such and Such. I'd better just give up now!" Sounds silly but it does to have worked more than once. Then again, the techs at GRAMPA may have figured out how to duplicate awe-inspiring items such as the Cosmic Cube.
Now back to Blackjack.
We get no clue as to how these two members got together or how long they have been around or why one of them goes around with a cowl so as to hide his identity while the other is perfectly willing to let anyone see who she is. In fact, we know very little about either of them except for the fact that they definitely love their work and are good pals.
Ace is the male member of the team and the one that always wears a full head mask, minus gaps for the eyes, nostrils, and the mouth. The forehead of this cowl/mask has a large capital 'A'. In addition to his head gear, Ace is customarily dressed in a gray suit and tie along with his firm-fitting gray gloves. Ace is very capable with the gadgetry he is given and is said to be "an adequate hand-to-hand combatant" and enjoys using small armaments though with GRAMPA, he is often supplied with extra-big weapons.
One-Eyed Jacquie is the female half of the Blackjack team. A very fit, well-endowed physique is shown by her form-fitting costume which looks much like a leather one swimsuit with numerous holes cut in the midriff. She has shoulder-length blonde hair and an eye-patch with a large Ace of Spades as its design. In addition to the arm-length gloves and thigh-high boots, she is always seen with a utility belt with nifty gadgets inside its many pouches.