I believe it is HP+HK+BL+RN+Away as the round is starting if you pick a female ninja. If you get a beep it means you hit the maximum number of buttons you can press at once and that stinks. I never heard of another way to get it. I've also never had a keyboard that handled more then 4 buttons at once very well.

Well, I sure know it isn't the same for PSX like every damn fan website says it is, because I had to search through the web that didn't give me the same buttons for PSX. For PC you have to pick any male ninja, and you get a male Chameleon and not Khameleon which is the female.

I am pretty sure at the select screen, pick the male ninja and hold Back + LP + HP until the game begins.
I use this controller, but I've had that beeping crap with the computer before.

Well. Didn't Work anyway

When I have to hold the buttons?
- Right after I choose a male ninja?
- In the VS Screen?
- Or before the Round 1, Fight?

Are you sure that Chameleon exists in PC?

For the PC version it's select any male ninja, and before the fight starts hold Back + HP + LP.