The Atom (Ryan Choi)
Katana (Tatsu Yamashiro)
Batgirl (Cassandra Cain)
Acomplished Perfect Physician (Yao Fei)
August General in Iron (Fang Zhifu)
Dr. Light (Kimiyo Hoshi)
Green Arrow (Connor Hawke)
OMAC (Kevin Kho)
Green Lantern (Kai Ro)
I Ching
Thunder (Gan Williams)
Lightning (Tavis Williams)
Other
Who is DC's most prominent Asian male hero? You could argue Katana and Lady Shiva (not a hero) are the biggest Asian female characters and both are original non-legacy characters.
The latter took up the Atom mantle while the former is Chinese Superman. In terms of non-legacy, I think you have to go back to Samurai of the Super Friends for the most recognizeable male hero. Not that he can't have an Asian American update like Wind Dragon in JLU.
Really wish Wind Dragon appeared in the comics as a straightforward hero. Out of all the Ultimen, he and Long Shadow have the best shot of being ported over a legitimate characters. Juice, Downpour, and Shifter all have more prominent equivalents already in the form of Black Lightning and the Wonder Twins, whom they were obviously based on.
I would say Karate Kid is one of the most prominent Asian male DC heroes. He's had his own title, and he's been around forever.
That's Dr. Light right? I don't think she's been seen for a while, both in comics and outside media.