[1] The only voice actors who used their real names were Lia Sargent (R. Dorothy Wayneright), Wendee Lee (Angel), Michael McConnohie (Schwarzwald) and William Frederick Knight (Gordon Rosewater).
[2] The Roger Smith character, originally envisioned as a private eye, shows similarities to Batman, James Bond, and Daisaku Kusama from Giant Robo.
As the series progresses, however, many of these traits are ironed out of his character, and he begins to exhibit a much more compassionate and open-minded attitude, learning how to cope with emotional issues and people instead of ignoring them.
His flashbacks and hallucinations during the series would seem to indicate that he was a member of the military before the Event occurred, apparently holding the rank of major, and was Big O's pilot even then.
[6] Inspirations for the equipment include characters such as Batman, James Bond and Dick Tracy; and shows like Thunderbirds, Giant Robo, and The Avengers.
[7] Roger's vehicle of choice is the Griffon (グリフォン, Gurifon), a black luxury sedan comparable to the Batmobile and James Bond's Aston Martin.
The car comes equipped with armor for the wheels and windows, missile launchers, a communications station, Browning machine guns behind the front indicators, smart glass camouflage, and a police scanner.
Of particular note is his strength; he has been able to carry Dorothy on several occasions, once even holding her while jumping down around 15 feet, while it has been shown that any other character in the series who has attempted to so much as move her can hardly even budge her.
Voiced by: Akiko Yajima (Japanese); Lia Sargent (English) R. Dorothy Wayneright (アール・ドロシー・ウェインライト, Āru Doroshī Weinraito) is Roger's personal assistant.
Dorothy stands just under 5 feet (150 cm) tall, has red hair, chalk-white skin and much more body weight than her slender appearance reveals (about 130 kg or approximately 287 lbs.).
Her dress is a size three and forehead houses an illuminated CD ROM drive, which is loaded from a drawer made to resemble a hair ribbon.
While capable of normal human facial expression, in film-noir tradition she typically maintains a pouty contour and a mildly sarcastic personality, described by Angel as being "perpetually foul-tempered".
She has shown genuine fear on a number of occasions and reveals jealousy toward Angel's relationship with Roger and satisfaction from its failure to become romantic.
[11] Series creators Keiichi Sato and Kazuyoshi Katayama call her "edgy" but "loveable",[4] aiming for a realistic character rather than the idealized portrayal of females that persists in anime.
[5] Dorothy shares a similarity in behavior, appearance and speech with the android Lal from the episode "The Offspring" from the series Star Trek: The Next Generation.
Aside from duties befitting a butler of a house, Norman is also a fine chef who makes it a point to keep hot food available for Roger no matter what time his employer's arrival home.
Where Roger drives his limo, Dorothy makes use of a bicycle occasionally, Norman's form of transportation is a motorcycle outfitted with a sidecar, ridden while the butler comically wears a "stormtrooper" (Stahlheim) style helmet.
In the present, Dastun began seeing a woman that looked exactly like the actress from the movie, Sybil Rowan, but not aged a day, roaming Paradigm City setting off explosions as a means of political assassination.
Dastun's pride as a member of the military police puts him somewhat at odds with Roger after he resigns from the force, and he expresses an extreme amount of irritation every time Big O appears.
However, as the series progresses, he reveals to Roger that his irritation stems from the fact that the military police do not have the ability to protect the city adequately due to frequent megadeus attacks.
Voiced by: Emi Shinohara (Japanese); Wendee Lee (English) Angel (エンジェル, Enjeru) is the beautiful woman Roger encounters throughout the series.
[16] Her role is that of a femme fatale, the woman who deceptively misleads and ensnares the hero or other males in order to gain some end they would not freely help her achieve.
"[18] Voiced by: Unshō Ishizuka (Japanese); Michael Forest (English) Alex Rosewater (アレックス・ローズウォーター, Arekkusu Rōzuwōtā) is the primary antagonist of the series.
Alex sees himself as privileged as being the son of Gordon Rosewater, and at times acts as a "spoiled child", as observed by Vera Ronstadt.
Voiced by: Issei Futamata (Japanese); Crispin Freeman (English) Alan Gabriel (アラン・ゲイブリエル, Aran Geiburieru) is an eccentric psychopath, a cyborg who takes Angel's place as Rosewater's assistant and the Union's liaison in season two.
Gabriel's real agenda is somewhat nebulous, though it would appear that he is straddling the fence between the Union and Rosewater, depending on who will give him the opportunity to kill the most people.
Voiced by: Shinpachi Tsuji (Japanese); Jamieson Price (English) Big Ear (ビッグイヤー, Biggu Iyā) is Roger's informant.
During the final episode, Big Ear is revealed to be an android, with synthetic skin applied over a metallic body, although this is not the case in the manga.
Voiced by: Sakiko Tamagawa (Japanese); Edie Mirman (English) The name of Sybil Rowan (シベール・ロアン, Shibēru Roan) applies to two different characters in Act:10.
Though identical to Dorothy physically, R.D has a more robotic, computerized voice, and displays psychotic facial expressions as she chases Roger through the subways.