Our last Legionnaire is Chemical King. His power was a bit confusing to quite a few writers. But if he was featured prominently in the story, you can bet his power was used correctly. He was a human catalyst who could speed up or slow down chemical reactions. King could control the metabolism in a person. Or cause metal to rust. Some writers would use his powers more like Element Lads, controlling and changing one element to another. Chemical King never had a girlfriend in the series and he died preventing World War VII. The background is Shanghalla, "the cemetery satellite where rests the mortal remains of scores of super-heroes from all over the cosmos...".
A bonus Legion related painting tomorrow.