Marvel's 'Cloak and Dagger' differs from the comics
Cloak and Dagger was originally created by writer Bill Mantlo and first appeared in Peter Parker, the Spectacular Spider-Man #64 (March 1982). The inspiration for Cloak and Dagger came to Bill Mantlo after a visit to Ellis Island. He recounted, "They came in the night, when all was silent and my mind was blank. They came completely conceived as to their powers and attributes, their origin and motivation. They embodied between them all that fear and misery, hunger and longing that had haunted me on Ellis Island." 
Ed Hannigan, the artist who collaborated on the characters visual design recalled that "Bill had a short page or two synopsis of the story that he showed me, and we discussed what the characters would look like. He gave me a lot of leeway, but it was fairly obvious that Cloak would be black and have a big 'animated' black cloak and Dagger would be white with a skintight leotard-type thing. I am not sure, but I think I might have come up with her ballet angle. I put the same kind of amulet/clasp on both costumes and came up with the dagger-shaped cutout on her costume, which was quite daring at the time." 
The characters debuted with their own story in 1983 as a four-issue limited series (written by creator Bill Mantly, penciled by Rick Leonardi, and inked by Terry Austin), and due to the series success Marvel later launched a bi-monthly Cloak and Dagger series in 1985.
Showrunner for the tv series, Joe Pokowski, tells Cinemablend that some changes needed to be made.
 Shayer, Jason V. (December 2010). "Cloak and Dagger: Child of Light and Child of Darkness". Back Issue!. TwoMorrows Publishing (45): 67–75.