Yaz Pistachio was introduced in June 1983 as Bobbi Harlow's sixteen-year-old niece in need of a date for the junior prom. Bobbi's ex-boyfriend, Steve Dallas, was recruited to accompany Yaz. The prom was a horrible failure, as Steve got drunk early on, the school quarterback insulted Yaz, and Steve ended up puking during their spotlight dance, although she and Opus did enjoy a dance together (the latter being supported by Binkley and Milo so that he could reach her). After that, Yaz appeared most often in early Meadow Party storylines, as well as in Binkley's Return of the Jedi dream sequence.
When Yaz challenged Opus to think of a stupider name than Yaz Pistachio, he responded 'Berkeley Breathed.'
Although she had a few storylines of her own in the strip (many of which were left out of subsequent Bloom County collections), Yaz never really caught on as a popular character. After her last appearance in the strip in January 1984, she was promptly forgotten in the Bloom County universe.
Yaz was usually seen wearing a flat cap.
Read more about this topic: Minor Characters In Bloom County