Zauriel

Zauriel is a fictional character in the DC Universe. Originally a guardian angel who served Heaven for millions of years, he willingly fell to Earth and becomes a superhero, having been a member of DC's all-star Justice League. He first appeared in JLA #6. In his first appearance, he saved Aquaman's life (over time forming a close friendship with him), and helped the Justice League thwart and dispel the forces of the renegade angel Asmodel.

Grant Morrison created Zauriel out of necessity during his tenure as writer of JLA, after being forbidden from using Hawkman. At the time, Hawkman had been declared off-limits by DC editorial due to the character's convoluted continuity (complicated by retcons from the Hawkworld limited series), which DC tried to negate during Zero Hour. As such, Morrison does allude to the Hawkman-connection by having Aquaman mistake Zauriel as "Katar" when the two characters first meet in the middle of a frantic battle.