Translucent is a new character created for the television show. In the graphic novel, the remaining member of The Seven was an "alien" character named Jack From Jupiter, an expy of DC's Martian Manhunter.
The show had to tone down the sex, drugs and profanity, which were all more graphic in the comics.
American actor Jack Quaid plays the part of Hughie in the series. In the comic book, Hughie is from Scotland and he resembles English actor and writer Simon Pegg. Pegg was "super chuffed" to be "immortalized as a comic book character" and also wrote the introduction for The Boys Vol.1 collection, "The Name of the Game." Pegg is also known for his role as Montgomery "Scotty" Scott in the rebooted Star Trek (2009) film trilogy, alongside Karl Urban who plays Doctor "Bones" McCoy. Karl Urban stars as Billy Butcher in The Boys. Pegg was originally supposed to play Little Hughie when the comic was made into a movie or series, but because it took so long to make the jump, he played Hughie's father instead.
Vought's premier team of heroes, The Seven, are a loose pastiche of DC's Justice League. Several of the Seven share powers and visual similarities with DC's heroes: Homelander/Superman, Queen Maeve/Wonder Woman, The Deep/Aquaman, A-Train/The Flash, Black Noir/Batman. Several other parodies of famous heroes feature in the graphic novels of The Boys and have been referenced but not yet featured on-screen in the show, such as Tek Knight (based on Iron Man) and the G-Men (based on Marvel's X-Men).
Jensen Ackles auditioned for the role of Soldier Boy in Season 3 after a phone call he had with Eric Kripke in 2020. Jensen and Kripke worked together on Kripke's show, Supernatural (2005), where Jensen played Dean Winchester. They were discussing another project Jensen was working on when the role of Soldier Boy was mentioned to Jensen. After auditioning via a self-recorded audition, Jensen was offered the role. This was the first television series for Ackles after long-running series "Supernatural" ended in 2020.