Roy Harper possesses no superhuman attributes, but he is a marksman of incredible accuracy. He is extremely adept at the use of the bow and arrow, as well as a wide array of weaponry. He also has the ability to take virtually any object and use it in combat as an effective weapon. Harper is also a skilled hand-to-hand combatant and he possesses keen analytical and detective skills. He has been known to speak Japanese[13] and understand Russian. After the loss of his right arm, Roy Harper received an advanced prosthetic, built by Vic Stone, designed to loop around his damaged nerve endings and restore him his usual degree of hand-to-eye coordination, albeit with the price of a constant phantom limb pain
Much like Nightwing and other members of the Bat-Family, Roy's suit is capable of emitting an electronic pulse. It is unknown, however, whether or not his suit is capable of emitting only one pulse, like Batman's and Nightwing's, or several. After being dismembered by Prometheus, Roy returns to his original Arsenal costume: despite being unknown if he still carries the EMP device, the new costume comes along with an advanced prosthetic limb, shown as highly resilient to bullets and melee weapons, and nearly as mobile as his former biological arm. His enhanced limb comes with increased phantom pain, bolstered if the fitting isn't done with the right alignment.
As Speedy and Red Arrow Roy uses a custom bow and trick arrows (with a preference for the more mundane kind as Red Arrow), mimicking his mentor Green Arrow. As Arsenal he's known to carry also guns and other kind of ranged weapons. Roy also has been known to use an M40A3 US sniper rifle with a kryptonite bullet on at least one occasion. His original Arsenal costumes were equipped with other exotic weaponry including a boomerang and electrified bolo. His current Arsenal costume, reflecting his angrier stance, is laced with several bludgeoning and cutting weapons, mostly knives and billy clubs, taped to his limbs and back. Despite being not technically part of his "costume" Roy uses his prosthetic right arm only when acting as Arsenal, removing it while going incognito.
http://en.wikipedia.org/wiki/Roy_Harper_%28comics%29#Powers_and_abilities
John Preston is the number one man of the Tetragrammaton Clerics law-enforcement division. He enjoys the status of a Tetragrammaton Cleric 1st Class, which is the highest possible level for a Cleric. As such, his physical skills, including acrobatics and the martial arts, and particularly the arts of the Gun Kata, are superb. He is easily able to take on several well-trained men in gun combat, emerging victorious in a couple of seconds, either by use of melee or ranged attacks. In fact, his accuracy and speed is unsurpassed, even in complete darkness, so that he can hit targets on all sides of him, and even behind him. His exceptional calmness and discipline are most useful in combat situations. When starting a Gun Kata he enters a near trance-like state of calmness that fools even a polygraph detector. He's also rather intelligent, deductive and plans ahead in time. His main weakness is the lack of social skills, although as a Cleric he doesn't need to do much talking.
Preston is also very intuitive and capable of sensing other peoples' emotions. This unusual ability and his aptitude for the Cleric work from a very early age has branded him a status as a prodigal Cleric.
http://writeups.org/fiche.php?id=2340
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