This ranking goes from most powerful to most useless. Some of these characters were never actually in the Legion of Super-Heroes, but were rejected and formed the humiliating Legion of Substitute Heroes because of their unquenchable passion to be super-heroes.
10. Bouncing Boy. He had the power to bounce. He is the most powerful character on this list, which should give you an idea of what is to come. I once made the mistake of joking about Bouncing Boy on a Legion message board. I learned that there are people in this world who worship Bouncing Boy. You do not joke about BB around them. I ask you readers, who would you rather have at your back, Wolverine or the guy who can make himself look like a beach ball?
9. Dawnstar. She could track life forms across light years, making her something of a galactic bloodhound.
8. Spider Girl. She had prehensile hair. Her hair could grab things. And the name makes sense because, you know, all spiders have hair that grabs things.
7. Insect Queen. Lana Lang, Superboy’s girlfriend, got a ring that gave her an insect power that lasted 24 hours. I don’t really know what that means, but it sounds lame.
6. Color Kid. He could change the color of anything. So if he was fighting the Hulk (in some crossover with Marvel), he could change the Hulk from green to red. This would anger the Hulk and he would crush stupid Color Kid. Frankly, I think he should have been in the Legion of Interior Decorators.
5. Chlorophyll Kid. He could accelerate the growth of plants. When you needed lettuce fast, he was the guy.
4. Duo Damsel. She was a girl who could make herself into two girls. Not many super-villains would find this intimidating, but can you imagine what she was like in bed?
3. Matter-Eater Lad. He could eat anything. He was not used much because writers couldn’t think of ways for him to help defeat villains. Matter-Eater Lad stands to this day as the archetype of Silver Age DC silliness.
2. Calamity King. He brought bad luck wherever he went, which is a highly problematic super-power. Who would want to be around him? His entire career he would be told, “Go stand by the bad guy.”
1. Rond Vidar. He had the power of immunity to super-hypnotism. When all the other Legionnaires fell to the power of a super-hypnotist such as his father, he would remain unhypnotized. This made him useful to writers, I would guess, in his origin issue. After he defeated his evil father, what did he do?