Stu from Rugrats was a wonderful homage to the 90s everyman and the incoming new reality of men taking up some of the domestic drudgery. It was one of the few shows at the time that had some incredible adult insight and humour for a 'kids' show and never spoke down to its audience - Hey Arnold being another exemplar.

The episode where Angelica breaks her leg and Stu is basically forced into indentured servitude as a result is a masterpiece:

Didi: Stu? What are you doing?

Stu: Making chocolate pudding.

Didi: It's 4:00 in the morning. Why on Earth are you making chocolate pudding?

Stu: Because I've lost control of my life.

Calvin is such an interesting character. He never "learns", similar to Charlie Brown, but his outlook is that of a scientist who just wants to "see what'll happen". Anything to occupy his hyperactive mind, whether it be spaceman spiff or a trip to the Triassic, or closer to reality, pranking Susie Derkins or trying to get the better of Moe (or Hobbes for that matter). He's not optimistic, but cynical. But his cynicism is irrelevant because he's driven by his avoidance of boredom.