Most of it has to do with a little thing called "character development".
In all honesty, you have to allow room for a character to grow and evolve in personality, and give us insights into quirks or characteristics over the years, because if a certain character remains exactly the same, then you're going to get bored pretty quickly, and then there's nothing special about the character anymore.
I hate to bring this back up, but take M*A*S*H for example, that show is a perfect example of how characters grow and develop overtime...
- Hawkeye started out as a booze-binging womanizer, who after a while stop drinking non-stop, and started to become a bit preachy (mostly because of how much creative control Alan Alda had in those later seasons).
- Margaret was a tough, by-the-book Army brat who always demanded perfection, and was easily annoyed by the antics of Hawkeye and Trapper (or B.J.), but after a while we saw that she had a sensitive side and had emotions and feelings just as everyone else.
- Frank Burns actually devolved, going from the un-official villain of the show, to a one-dimensional pathological twerp.
- Radar's development was a bit of a roller coaster, as he started being worldly and squirrely, constantly sneaking a shot of brandy or a smoke, then he became an innocent and naive farmboy who nearly puked at smoking cigars or having a shot, but then he became hormonal during his final appearance on the show.
- Colonel Potter came to camp as a tough, by-the-book commanding officer, but mellowed into the sort of grandfather figure of the show.
- Even Klinger started out as being that weird hairy guy running around in drag to convince people he's crazy so he can get discharged from the service, and what happened? After a few years, he stopped wearing dresses, and started acting like a corpsman, even getting promoted from Corporal to Sergeant... even though Klinger was much funnier running around in dresses.
It's like Sonia Manzano once said even, a lot of people still watch SST for years after they first started watching, because unlike most shows, the human cast has been allowed to age and grow with the show, which works well because people in real life really do change, and we've all seen Maria grow from a teenager on the street, to a female construction worker when feminism was in the news, to marrying Luis and having Gabi, etc.
To add another point to Frogster's nitpick, Steve Whitmire has says that often times it's difficult to NOT go overboard with Kermit's expressions because his head is so flexible compared to other Muppets.
So there... just adding my half-cent's worth.
In all honesty, you have to allow room for a character to grow and evolve in personality, and give us insights into quirks or characteristics over the years, because if a certain character remains exactly the same, then you're going to get bored pretty quickly, and then there's nothing special about the character anymore.
I hate to bring this back up, but take M*A*S*H for example, that show is a perfect example of how characters grow and develop overtime...
- Hawkeye started out as a booze-binging womanizer, who after a while stop drinking non-stop, and started to become a bit preachy (mostly because of how much creative control Alan Alda had in those later seasons).
- Margaret was a tough, by-the-book Army brat who always demanded perfection, and was easily annoyed by the antics of Hawkeye and Trapper (or B.J.), but after a while we saw that she had a sensitive side and had emotions and feelings just as everyone else.
- Frank Burns actually devolved, going from the un-official villain of the show, to a one-dimensional pathological twerp.
- Radar's development was a bit of a roller coaster, as he started being worldly and squirrely, constantly sneaking a shot of brandy or a smoke, then he became an innocent and naive farmboy who nearly puked at smoking cigars or having a shot, but then he became hormonal during his final appearance on the show.
- Colonel Potter came to camp as a tough, by-the-book commanding officer, but mellowed into the sort of grandfather figure of the show.
- Even Klinger started out as being that weird hairy guy running around in drag to convince people he's crazy so he can get discharged from the service, and what happened? After a few years, he stopped wearing dresses, and started acting like a corpsman, even getting promoted from Corporal to Sergeant... even though Klinger was much funnier running around in dresses.
It's like Sonia Manzano once said even, a lot of people still watch SST for years after they first started watching, because unlike most shows, the human cast has been allowed to age and grow with the show, which works well because people in real life really do change, and we've all seen Maria grow from a teenager on the street, to a female construction worker when feminism was in the news, to marrying Luis and having Gabi, etc.
To add another point to Frogster's nitpick, Steve Whitmire has says that often times it's difficult to NOT go overboard with Kermit's expressions because his head is so flexible compared to other Muppets.
So there... just adding my half-cent's worth.