(actually that is after sigma absorbed the maverick virus from zero when he was first activated. when zero was first activated he was insane and evil. and at first sigma was actually a good guy. he just absorbed the maverick virus from zero. so zero IS insane.)
"you will make a great warm up!" zero said while suddenly appearing behind this man and sending a drop kick to his head.
"oh so you do have some fight in you!" zero exclaims while taking out is buster and firing a charged shot at the gohadouken. which in size comparison it was about 3 times larger but only about two times stronger.
Akuma teleports before it could hit him. "Hmm......... You actually appose a threat." he says with a chuckle.
"I think I like this guy!" says a man from the shadows. While in the shadows, you can see a man lighting a cigarette. He walks out of the shadows towards them. "My name is Kazuya Mishima. Pleased to meet you."
He smiles wickedly. "I want what you want: world domination. Why not try to do it together? We are the same: we hunger for POWER! So, why not work together and take over this world?" he says, holding his hand out for a shake.