Yeah, Jagged Alliance is all about the campy quality of the characters being overblown stereotypes to a nearly offensive degree in some ways. It's definitely toned down in Jagged Alliance 3 in comparison, most notably with Steroid losing his distinctive terrible Ahnold-esque parody voice. Inter-merc banter and chatter is another major part of it that I'm still experiencing and found that Red and Livewire have some pretty fun dialogue quips even though Livewire is new to this game. I'm not sure if 3 approaches it the same, but in 2 every character had some other mercs they like, some they can learn to like but start neutral, and others they dislike. It can affect who you can hire, how they get along in the field, squad composition and morale. People paired or grouped with someone they dislike will refuse to renew their contracts and generally do poorly, but it can also lead to some amusing dialogues. Not surprised Fox and Wolf still mesh well, they're a classic pair with the implication they're fucking off duty.
I've been meaning to kind of take a look and really note the bios of the characters in AIM because I have seen a few mentions of Arulco, which is the setting for 2, and kind of establish an idea of what the canon team was that dealt with the events of that game and see if I can derive lore from it, because I'd like to go back and do a canon run of JA2 vanilla for personal amusement.
I'm definitely going to look forward to what kind of mods come out for JA3, the devs have said that it's basically the tools they've used to make the game. I don't know if it's going to have all the features at once or if the world and quest tools are going to be coming later, but they've definitely said that they look forward to seeing if fans remake JA1 and 2 with 3's tools. Already there's a mod to re-add the mercs missing in 3 from 2, even though they're more or less just portrait rips and don't use the voices (which kind of defeats the entire purpose honestly), but maybe one day we can have them back fully voiced again.