Pro Wrestler, Transformer, or Porn Star?

Trailbreaker! I've come for the sixth key!

I hope you're up for the challenge of, "Pro Wrestler, Transformer, or Porn Star"!

What on Cybertron are you talking about?

I'll give you a name and you must identify if it belongs to a pro wrestler, a Transformer, or a porn star!

Name number one: Grindcore. Pro wrestler, Transformer, or porn star?

Transformer.

Correct! Name number two: Hardhead. Pro wrestler, Transformer, or porn star?

 Transformer.
 

Correct! Name number three: Blowpipe. Pro wrestler, Transformer, or porn star?

 Transformer. Before we continue, isn't "The Transformers"

an animated series intended for Earth children?

 Correct and yes, it is a show for Earth children!

Bring on more names!