Basic use: Self Defense. The knife would be capable of penetrating and cutting.
Folder
Size: 6 to 7 inch "blade"
Handle shape: long and tall enough to contain the blade
Lock type: Backlock
Blade shape: A 6 to 7 inch Marlin Spike / Knife, amalgam. The forward most 2 inches of the blade (at the tip) would be pure Marlin Spike. Then as the Marlin Spike gently curved, a blade would gradually grow under it to 1 inch tall full flat grind. The profile of the "blade" and handle would be that of the gentle curve in the Native Chief.
Grind: Marlin Spike to Full Flat grind
Blade material: Whatever Sal thinks is sufficient, but a decent steel, not 8CroMov....something like S35VN at least.
Handle material: G-10
Sheath: None
Does this knife have a use and purpose in the Spyderco line? Yes, pure self defense tool.
Is this knife a good design? Yes, excellent design.

THINK: Competition for the Cold Steel Ti-Lite Folding Knife 6", or Frenzy I Folding Knife 5.5"