Hi. I was just wondering this question: I have a Hero Chao with dull yellow and blue stripes and a large striped spike with 2 super small spikes sticking out of the big spike. So do I feed it "green" type animals or green Chaos Drives or both? Thanks. Oh, and please don't make fun of my name. It's the name of one of my Dark Chao.
It sounds like you have a Hero-Running-Normal chao... this chao can't become a Sonic chao because a Sonic chao is Neutral-Running-Running, not Hero. But to answer your question, use chaos drives (green for the Sonic chao) rather than animals for second evolution.

~ Crazy C Lea