There are no DOA characters that require high execution skills.
High risk/high reward generally refers to an unsafe character that gets a ton of damage (reward) if their attacks connect. It does not usually mean satisfaction/reward.
Kasumi has average damage at best, and is just as risky as 80% of the cast.
Exactly. She's the closest to what franman is asking. You're right though, Kasumi doesn't have much reward. If any at all. I was just trying to find a character that has something. Kasumi's teleports are nice and unsafe. Closest I could think of anyway. Loosely is putting it mildly.
Her combos are extremely unsafe. It takes so many hits just to reach the same damage as say Hayabusa does with a small juggle. If you can pull off her CB, that's some nice damage, at least what we saw with Kayane's Kasumi.
EDIT: Of course, Allan. Sorry, I meant her style is what I like. Her style is nice for people that like aggressive characters.