Have you met different (OC) devils that aren't originally from the One Piece world? Like a devil who is called the Uta Uta No Mi(sound sound fruit)? Please don't send Ope after me!

Gomu

Don't worry, human. You used proper grammar, capitalization, punctuation, and didn't add a smiley face. I will not send Ope after you.

Ope

Don't talk about me like I'm a dog, Gomu!

Moku

Heheheh! Ope's a puppy!
*breaths in smoke*
...Dude... What if we're all puppies and we just don't know it?!
/)°0°(\

Ope

NONE OF US ARE PUPPIES, YOU IDIOT STONER!

Moku

YOU WANNA GO, BRO?!
FIGHT ME, IRL!!

Ope

THIS IS REAL LIFE!

Moku & Ope

*RAWR!!*
*roll away fighting*

Gomu

I hate them all...

And to answer the question, no. We have never interacted with devils who do not live in our own plain of existence.

*CRASH!!*

Oh god, now what have they done?