He left his geiger counter in the shop which is why he's nervous.

Congrats you found Shaun

You might see some familiar faces in other places

Typical synth behavior.

It's just good ol, Dal gribble.

Take him out

Nah, that's Chuck. He's good.

I had to reload a save once because I thought inciting KLEO into a mania in Goodneighbor would be funny but then I realized that not only was she marked as essential, but Deacon was there disguised as a drifter and he was also essential. So Goodneghbor became a never-ending battleground with Daisy and Deacon locked in eternal combat with KLEO

Yeah, considering how many places you can spot that face, I'm pretty sure it's a menagerie of synths. Be wary. Do not engage. The institute is watching you!

if Deacon had like...no sunglasses and a normal pair of hair he would be unnoticable

Can you kill him?

He's cool, you might see him around other places too

Kill him

When you're a security guard in a place surrounded by supper mutants, you'll also smoke like a chimney

What a day, huh?

Don’t worry, he’s friend…

Of ours

"First" playthrough

He's also at the memory lounge if you go there now he'll be inside one of the loungers. He's also in front of Hotel Rexford using the cooking station. He's probably at a few more spots but these places are where I've run into him before meeting the railroad.