Kepler usually follows me for a short time, then sits down and waits or walks about... i met him twice so far.
I only met Fermi today for the first time, he is a pretty white wolf and he appeared when i killed a bunch of bandits. Then when they were dead, he sit down near one of them and just waited there while barking time-by-time.
So, anyone have any idea what mod adds them in? I can't really figure out as i have multiple mods that add new NPCs, but i don't know any of them adding these wolves into the game...