World of Ptavvs by Larry Niven (1966)
The Ophiuchi Hotline by John Varley (1977)
Icehenge by Kim Stanley Robinson (1984)
Take Back Plenty by Colin Greenland (1992)
The Whisperer in Darkness by HP Lovecraft (1930 - this isn't set on Pluto, but the aliens are fungoid growths from Pluto - amusingly this story was probably written before Pluto was discovered in Feb 1930)
A short story by Stephen Baxter and I don't remember its name
The astrological symbol Pluto represents the principle of destruction, clearance and death. People may wish to protest that it also represents creativity and rebirth: yeah, yeah.