@Ernest Bywater
Them is one of those odd words that can be used in a gender neutral way and will cover single as well as multiple people except where it's blatantly clear after having already spoken about a single person by direct reference.
…
If you start talking about Fred you can't then switch to using them to refer to him. However, if you start talking about an unknown person you can use them to refer to the person as a single person or multiple people.
No, in my case, the readers will immediately know who he's referring to, as it's the start of fight, but again, though I couldn't find any online usages of "'em", I may stick with it anyway as a common usage utterance, just 'cause "'im" is so far out in left field.
So, in your opinion, which would be better to use in spoken dialogue: "'em" or "'im"?
Just to clarify, here's a short passage, to help put the example in context:
"No? I'll tell you what, I'll give you the first punch, and then all bets are off," Paul challenged.
However, the kid hesitated, either questioning whether he could win or suspecting a trap. Paul shrugged, started to turn, then spun around, throwing a punch that seemed wide of the mark. However, the kid stumbled back, gasping, before he collapsed, clutching his throat, coughing and chocking. His two supporters immediately backed up.
"Anyone else?"
"I thought you were giving him the first shot?"
"I got bored waiting for 'im. Bullies are all talk, but we're from the mean streets of New York. I've seen beatings on the street, gang initiations, police shootings up close and personal, and dead bodies galore."
…
"Man, that was so neat! Did you plan that?"
"No one's ever stood up to Bud before. It was great seeing you whoop his ass!"
"Can you show us how to do that?"
"Do what," Paul chuckled. "He slipped and fell. I never touched him."
The kids again glanced at each other, gauging each other's reasons.
"You're right, I didn't see a thing."
"You never laid a hand on 'im. He was backing up so fast, he fell hard."
"Is what he said true?" Peg whispered.