Blue Beetle
Just a regular high school student from El Paso, Texas, Jaime gained the scarab ( or beetle ) after Ted Kord lost it. With the scarab he has great power and uses that power to protect the innocent. He appeared in 351 issues.
Black Manta
The boy who would become Black Manta was an autistic youth who grew up in Baltimore, Maryland, and loved to play by the sea. As a youth he was kidnapped and forced to work on a ship for an unspecified amount of time. At the point he apparently saw Aquaman with his dolphin friends and tried to signal him for help but was not seen. Finally, he was forced to defend himself, killing one of his tormentors on the ship with a knife. Hating the emotionless sea ( and Aquaman, who he saw at its representative), the boy was determined to become its master. As an adult, he designed costume ( primarily a black wetsuit with bug-eyed helmet that was able to shoot blasting rays from its eyes ) and fashioned a high-tech submersible inspired by black manta rays.