So, is Johnny like Blaze's version of Metal Sonic?
Is there possibility of a Metal Blaze out there?

well. Uhh.. kinda ? Not really
Since he was made with whiskers to find specifically just the jeweled scepter so he’s more of a villain of the week? Not really made to fight or compete with blaze
I mean blaze doesn’t really care or interact with him so idk about him being metal sonic equivalent

Oh. Huh, I don't really get those lot. Also, so Eggmsn Nega just built one or more robots themed after a pirate?

he built pirate robots cuz its a sea based location
and he wants them to terrorize people for the hehes

Hm, that explains it.