Varla Spengler -- poster child for inventive brilliance gone wrong.
Like her dad, Varla is unreasonably intelligent -- so much so that it interferes with her ability to relate with others. She is possessed of a morbid fascination for strange lifeforms (and post-lifeforms) and she tends to look at people as little more than complex organisms. Due to her lack of social knowledge or any tact, she neither spends much of her time around people nor has she ever been concerned about her appearance (though, maybe one of the others may have once commented about it). She doesn't necessarily hate people, she just doesn't find them very interesting and the the sentiment seems to be mutual.
Her biological and technological expertise, however, is virtually unparalleled even in this day and age, making her a very attractive specimen to various government and non-government agencies. However, while she would love the funding to advance her ideas, she is notoriously incapable of following orders -- a trait that has put her at odds with various city officials over the years.
Varla was always intrigued by her dad's old business and if Richard found the money to get the Ghostbusters up and running again, she'd be all over that like mold on bread.
She also fails to see what is so odd about collecting spores, molds, and fungus.