Jump to light-speed
No abrupt jumps?
Not sure I agree with that part. How often have we seen the hero's family/lover/friend gunned down, the hero immediately picks up a gun and heads out to apply justice to the bad guy(s)?
ie: Luke Skywalker and 3/4th of the westerns ever written.
Isn't it more dramatic if the arch is a roller coaster ride--ups and downs--not so even?
Certainly romantic novels require change in the MC since without it, the book is just a diary. But as Ziljon observes, so-called 'flat characters' have brought us some great fiction. I've just re-read Maltese Falcon and The Thin Man. I didn't notice any change in any of the characters. Same with Holmes and many, if not all, of the film noir-type detective stories. Maybe this is reserved for the M/S/T genre.
Is the 'change' seen in these 'flat' characters simply that their personalities are exposed, and we are surprised by how they act?
Per Uncle Jim, didn't I read that all of the (presumably major) characters should have an arc? They all 'star' in their own lives; have individual motives, etc. We see changes in Luke and Hans, the Lion, Tin-man and Scarecrow in Wizard, but the other MCs don't show change? (There must be better examples, but, hey!, it's Friday!)
Althrasher: why is the fish hook lower at the end and not higher than the starting point? If the MC sinks into chaos, then rises to redemption, shouldn't the end point be higher than when s/he started?