A fussy person is someone who is overly particular or demanding, often about trivial or insignificant things. There are several different terms that can be used to describe such an individual, including picky, persnickety, finicky, nitpicky, fastidious, and meticulous. A picky person is one who is extremely selective and choosy about almost everything, while a persnickety person is someone who is excessively concerned with minor details and has a tendency to be overly critical. A finicky person is one who is difficult to please or satisfy, while a nitpicky person is someone who constantly finds fault with small things. A fastidious person is someone who is very neat and precise, while a meticulous person is someone who is extremely careful and thorough.