The guy on the right? That's Thorin. He's 12 years old, and a wonderful cat. He's annoying sometimes, but he's also incredibly sweet and patient. Great with kids and strangers.
The guy on the left is our latest addition. He's probably about a 1½ years old, but we don't know because he was feral. He randomly showed up in our yard about 8-10 months ago. The first time he didn't scurry away after my wife stuck her hand out, he bapped it. So she calls him Bam Bam. But she also spelled it "Bamm." So I decided his full name is: Jean Clawed Van Bamme Bamme.
I think she hates it lol
She had been wanting to bring him in. My stipulation was that he be neutered before that happens. So on the 18th, we got him neutered. We weren't sure if he'd stay inside or if he'd be a TNR. To be safe, we did get his ear ticked. We just needed to keep him indoors and separated for a couple days.
But he adjusted to indoor life so well that I'm pretty sure he'll be living inside on a permanent basis. He's kinda shy, but really sweet. Thorin picked one fight with him, lost, and has been sweet on him since. I guess he finally realized he's old as dirt. We checked them after. Everyone was fine, just bruised egos. Our other cat, Izzy (age 9 years, female, calico, medium long hair with a lion cut, smelly), is anxious and hates strangers, and she's been nice to him since he came in.
So anyway, now I feel bad for the ear tick. It just made him pointlessly asymmetrical.

But he's still really cute.
He'll need a little more time, but I think he'll lower those walls sooner or later.
How many braincells though?
Maybe half of one, tops.