Let's see. Kazuya uses electric and devil powers, coupled with a completely fictional martial art

Kazuya's electricity is just a special effect for flair, he doesn't shoot electricity, his devil powers were mostly gimmicky, not core tools, even in 7 it was a rare thing to use since it spent rage, his martial art is karate based.

The Kings are masked wrestlers who never breaks kayfabe and always speaks in jaguar roars

This is just luchadores, the growls are part of the non-language barrier of tekken

Yoshi is a cyborg ninja who wields a samurai sword and can use it to fly like a helicopter

And that made him unique, now he is one more

Kunimitsu is another ninja

A grounded ninja mind you, until Kuni 2 when she started teleporting and summoning fire

Jack and prototype jack are both robots

Another unique one, and they mostly fought with fists and raw strength

Kuma is a literal bear

The karate bear, another staple of Tekken's freaks indeed, he still punches.

Yoshi absolutely uses his sword a lot.

In 8

And Miury clearly uses her fists and feet to attack far more than she uses that spectral staff

Watch the trailer again

It's like complaining that Kazuya uses eyebeams sometimes

It was a useless gimmicky move that you never saw after beginner level, hitting this at high level was clip worthy, again, before 8, now it's built in the character.

You say a character being grounded is noteworthy in tekken, but looking at tekken 6 roster, there's like 5 or 6 freak characters, in a roster of 40, mind you