I see great potential in those characters and I ask two questions:
1) Do the games that they are "featured" in really develop them? (more than their first appearances?)
2) Were either one of them arrested for killing the other's brother?
To address your 2nd question first, in "RON 2 and 1/2: Fowl Play" the Baron goes to the Sheriff to have the chicken arrested, which does happen although the chicken escapes at the end of the game.
It's in Creed Malay & Denzil Quixode's "Kittens" story-arc that delves into the Baron's side of the story and his plans for revenge against the chicken. I'd suggest playing "Cabbages and Kings", "Kittens and Cacti", and "Apocalypse Meow (Chapter One)" in order to get the full scope of what the Baron is planning (and the fact that the games are good).
I am always amazed at your ability to keep the bulk of the dense, byzantine history of RON straight in your head. 8)
I played most of the early RON games, but I can't remember exactly what happened in which game anymore.
Thanks I'll look into those games.