What I want:
Make the aliens more badass- Delay ignite ability for Swampfire, Echo Echo can make solid objects out of sonics, Humongosaur can survive in intense heat, and Jetray can become a living bullet.
FIX ALIEN X, GODDAMNIT!
That Echo Echo and Jetray idea is good, but here are some more ideas:
Spidermonkey: Make him grow stingers or oni fangs to inject paralysis poison.
Chromastone: Make him throw spears of his crystals like the Lucifer in Devil May Cry 4. Plus add in the monologue that went with this weapon.
Big Chill: He has a secret apparently and I want that secret to be that he is at his larvae stage. I bet the evolution process will disgust Gwen and Kevin.
Goop: The writers should make him shape individual individual parts of his body. Imagine him with finger knives.
Swampfire: I want to see him sprout flaming vine chains. Seriously, that make this guy SO much more badass than before.
Humongousaur: Let him have earthbending abilities.
Sorry, I've been watching Avatar and I think Ben having Earthbending skills would be sweet.
Alien X: I'd like to see Ben fuse with the other two parts of this form. Bet that'd fix this guy.