They can be known as professional mourners.
Paulbearer's?
If it's what i think you mean...then sick mean people.
morbid
Funebrophil
Taphofile That's the name for people who love funerals and graves and cemeteries.
sociopath
you call them bitefull
a traveller...
Pyromaniac.
geek
sharp
belligerent
a geologist
a traveller...
There is no special name for a person who likes squirrels.
Imaginative