1. Virgil, handy healer and info source as well as a major plot character. (Can be improved later in the game if you choose to rescue him. He ends up with the ressurection spell!)
2. Magnus, AKA "little Malcom" somehow ended up seriously disliking my main character towards the end!? Despite the fact that I helped him to find his lost clan.
3. Franklin Payne, mentioned in Caladon, found in Ashbury before you sail to Thanatos. Has the funniest dialogue in the game especially when you ask him about the Vendigroth Wastes.

Dog! (Dogmeat) - Ashbury - had rough times with some gnome (which is really interesting, because I am absolutely positive, that he could kill him in two turns) - great "fighter", doesn't count in your sidekick cap.

Haha, I don't think I ever found the dog! I remember the gnome I think...he was in Dernholm tavern I think?
If I'm not mistaken I think they included Dog in Arcanum because most of Troika were originaly from Black Isle and wanted a not-so-subtle reminder of Dogmeat.

Yes, gunslinger gnome (little evil one) is in Dernholm pub.
To get the dog, you must find him in your first visit in Ashbury near city hall.... And fast or that noname gnome will kick him to death!
Edit: Yeah, but more direct reminder of Fallout is brahmin in museum in Tarant :)
Ok, that's it! I go install it again.

Damn! I missed the brahmin skeleton! Doh...