Manchester Black is a DC knock-off of Jack Hawksmoor and Jenny Quantum from The Authority. He's apurple-haired Brit with electro-kinetic and telepathic powers... I think.
Man O'War is a post-Obsidian Age Aquaman character who first appeared in this year's Aquaman Secret Files. Essentially, an Atlantean spliced with a deep sea jellyfish, with enhanced agility, senses and bio-electric blasts.
