Love him in this movie and in Trespass. He had a very likable to him. He came off like a dad or uncle. Good sidekick energy.

Yes, we’re communicating in English (other than your nonsensical statement in your post below in which you wrote ‘He had a very likable to him.’) Why do you ask?
How are you getting along with your fellow Sisters?

Is this English?

Wow, that’s the kind of mindless bitchy-****** response one would expect from one of The Sisters Let’s get you signed up…

Dude acted for 40 or so years. What the **** do you know about acting?

He combines poor acting with undeniable likeability.
‘A…and the antennae array is gone. Didn’t you see it!?’
Terrible delivery, but you still like the guy. He trusts McClane and he’s the one who figures out how to contact the planes, and he just has a warm, fuzzy dwarf vibe.
It’s a damn tough question - who is McClane’s greatest negro ally? Powell, Barnes or Zeus?

he does have an awesome coat!
Season's Greetings!

What's not to love about Barnes? - His warm and toasty waistcoat, his comforting moustache and little grey afro, and his funny voice that sounds like a husky munchkin.

A memorable character actor.

I think he's very good in this movie and plays the character of Barnes excellently. I saw the movie in the theaters in 1990 and never once thought 'oh, wow, cool a black guy is an aircraft control technician'. But, at the outset he's stunned to learn of the terrorist plot as are Trudeau and Lorenzo and critically underestimates Stewart's motives at first. But, Barnes quickly learns to trust McClane's judgement and uses his knowledge and expertise to be as resourceful as McClane cracking two critical elements of the movie - how to contact the planes overhead and finding out Stewart's location. Barnes is a critical element to the plot because he thinks of things no one else does. And he rightly does not trust Grant keeping his thoughts about Stewart's location to himself and McClane.
The best part about this movie is the scene when they uncover Stewart's location at the church. I love the 'shing' sound when the guy wrestling McClane pulls out a huge knife and the sound of Barnes dialing quickly to Lorenzo he realizes they've found Stewart's location!

Wouldn't surprise me if they were dubbed. A lot of dialogue in action movies is dubbed in post-production. A couple of possibilities are bad recording when they were shooting the scene, or a change in dialogue for continuity due to editing. Just a couple of examples for ya.

It seemed like a lot of his lines were dubbed in post to me.
Anyone else?
The sound doesn't quite fit the image at times, and he also seems too loud in the mix sometimes.
The bad guy who is about to kill McLane when he is on the ground by the moving sidewalk also seems to be dubbed.

I think it's partly because we are used to seeing technicians in movies played by nerdy-looking white guys.
So just by being nonwhite he pleases audiences (well, discerning audiences like us) by being "different" from standard casting or whatever. I think that's mostly something people like but we don't consciously realise we like it. But yes he also does play it with a general likability.
Although, I dunno if I'm just imagining this but I think there are a lot of minorities in the air-traffic-control in US. Maybe I'm wrong.

"And the number one reference that I am running into the ground is: Homer Simpson!"

he's awesome!
'where do we get those big portable lights? borrow them from batman?!!'
Season's Greetings!

He adds a certain something to the film. He is likeable but such a bad actor!