What is the name of old cartoon with a blue guy long black hair and Z on his shirt. kinda reminds you villain mr.incredible?

The cartoon you're describing is likely The Powerpuff Girls.

* Blue Guy with Long Black Hair: This describes Mojo Jojo, the main villain of the show.

* Z on his Shirt: Mojo Jojo has a large letter "Z" on his chest.

* Reminds you of Mr. Incredible: Mojo Jojo's appearance and evil intentions have some similarities to Mr. Incredible.

Let me know if you have any more details that would help pinpoint the cartoon!