In depth - it doesn't just evolve into Hero, Dark or Neutral - it evolves into different
types of each. The type it evolves into depends on what attribute your Chao is best at.

To make a certain type, choose whether you want your Chao to be Hero, Dark or Neutral, and
give it a certain colour/cl*** of of drives/animals to make sure it is best at that stat.
This way, when it evolves, it will look like the desired Chao.

FIRST OF ALL,there airn't any chaos drivers in SADX,that's in SA2B.SECOND OF ALL,there are
diffrent forms so in SADX and SA2B so that would mean not every type is going to make a
chao look diffrent.You don't know anything about SADX do you.Well I've got the real answer
since I have both SADX and SA2B.O.K. if you want a hero chao you obviously give it a lot
of hero fruit.If you want a dark chao give it a lot of dark fruits.

go to the website called chao island

chao island has every thing it tells you how to get stuff and shows what other nuetral
chao there are

go to http://groups.msn.com/ChaoUtopia/chaoevolution.msnw its probably way better

you can evolve it into any kind of chao just go to chao island.com to find out how and how
you want it to look like