I don't know of any nouns that describes a person who thrives under pressure. In basketball and sports in general, I know people who do well under pressure are called clutch. However, clutch would be an adjective. Are there any nouns that fit this description? If there are no nouns, what other adjectives have this meaning.
I have a citation for these nouns as part of popular culture's definition of a person who is addicted to stress: (1) stressorexic; (2) stressoholic; and (3) stressball.
The citation, though admittedly slightly weak and pretty comical, is, at least, a popular culture dictionary of sorts: Urban Dictionary.
Possibly related: adrenaline junkie.
"They [adrenaline junkies] tend to create drama and crises in their lives—either on a conscious or unconscious level—to trigger the body’s stress response and get the rush that comes with the excitement. These are people who don’t merely survive well under pressure, but work best under stressful circumstances.