Aquaman. He has the ability to telepathetically communicate with fish. It could be useful if he were a member of the Sea Shepherd, telling whales to flee from Japanese whalers... but as a member of the JLA it seems kinda lame.
Actually, it still would be useless. Whales aren't fish, they're placental mammals
Originally Posted by SofaMan
Hehe - the Great Lakes Avengers. Mr. Immortal, who literally couldn't die. Which is to say, he could be fatally wounded, but would heal pretty much instantly.
I'd argue that this is a awesome superpower. Sure, he'd take a hell of a beating, but would defeat almost _any_ supervillian. Eventually