Ok, i was a picture of a chao that was green, had these long head things that go almost to the ground, and a weird (i think blue) marking on its head. how do you make this chao? ((p.s. site rocks! best sonic site on the net!))
That sounds like a Neutral/Swimming/Swimming. Raise a Neutral/Swimming chao and continue to give it yellow drives to make its appearance change further.

~ Crazy C Lea