Man Child: Bert's the same age as Ralph and Melissa, both already married. They all attended the same school, the same grade along with Cedric Sneer. They all graduated from college. So, all of them must be about 25 to 30 years old. Also Bert doesn't live at his own home, Ralph and Melissa let him stay with them. However, almost every chapter we see Bert playing dangerous antics and acting as if he's still a teenager, if not a kid.
Put on a train: She was Demoted to Extra by season three, where she only appeared in three episode(her second to last one "The Evergreen Express" where she was in the train). She made one more cameo appearance in "The Headline Hunter".
MacGuffin: He wears a star on his collar which is important to the plot in The Raccoons and the Lost Star.
Bad Boss: Was this to a degree early on. As he softens up, the pigs commit atrocities that are actually fully deserving of Cyril's frustration at times - what they do in "The One That Got Away" for instance.
Even Evil Has Standards: Throughout the series, Cyril has lines he will not cross when it comes to making profits and, more than once, he makes sacrifices for the greater good, especially when it comes to his son, Cedric. It gets to the point where, in the later seasons, the 'evil' part is practically gone.
It shows in "The One That Got Away" when he was furious about losing the beloved fishing pond to toxic waste and when he found out it was the pigs who did it as a moonlighting job, he started a rant that shows how much he cares.
Cyril: You want money? Here! Here's lots of money! Take it all! Take some more! Just give me back the fishing hole! Can you do that? Can you give me a price on that? Can you?
Flanderization: Inverted - whilst his lust for profits/money is a recurring trait, the early seasons is when it's at its peak.
Karmic Jackpot: The nicer Cyril got in the series, the more his luck improved because his proper moral choices.