Yay! M-B would love to have him over and she'd love to give him a tattoo as well :)
Tommy might be amused by Joe but generally, he wouldn't be bff's with a guy like him. He's too mellow for his own good, really but he'd be nice to him. And no, Ariella would not appreciate Joe hanging out with her son if he's a bad influence.
Hellfire's in the media a bunch and they bomb random, public buildings. Most people from Frye Island know of them and some people in it, so it'd be hard for Joe not to know them. The line with Jimmy sounds... odd but interesting? We shall see!