Sin debut in 1984 in Captain America #290 as Mother Superior. Created by J. M. DeMatteis and Paul Neary, the character is the daughter of Red Skull and sometimes girlfriend of Crossbones. While she’s had different portrayals over the years, she’s featured abilities such as Telepathy, Teleportation, Psychokinesis, and Phasing.
Created by Jim Steranko, Viper debuted in 1969 in Captain America #110. She’s a notable swordswoman, martial artist, and markswoman.