Johnny Quick is the Crime Syndicate’s evil Flash, who mainlines a (literal) speed drug. Not as awesome as any Reverse Flash, and not the heroic Golden Age Johnny Quick. Oh well. He looks cool (the original CSA Johnny Quick does not).
Owlman, the Crime Syndicate version of Batman. He’s an amazing character in Grant Morrison’s Earth 2 graphic novel, and that is totally trumped by the version of the character in the Justice League: Crisis on Two Earths direct-to-DVD movie.
Ultraman, the Superman of Earth 3 (or Earth 2 if you’re a Grant Morrison fan). He is the evil leader of the Crime Syndicate of Amerika. I love dopplegangers, especially evil opposites. Morrison’s Earth 2 graphic novel is a major highlight of his JLA work. Highly recommended if you haven’t read it.