Druid
Eeyore
Jeremiah
admonisher
astrologer
augur
calamity howler
cautioner
crepehanger
crystal gazer
cynic
defeatist
divinator
diviner
divineress
flagman
forecaster
foreknower
foreseer
foreshower
foreteller
fortuneteller
geomancer
haruspex
killjoy
lighthouse keeper
lookout
lookout man
malist
monitor
negativist
nihilist
palmist
pessimist
predictor
prefigurer
presager
prognosticator
prophesier
prophet
prophet of doom
prophetess
psychic
pythoness
religious prophets
retreatist
seek-sorrow
seer
seeress
sentinel
Alexandra
Chandra
Sandra
calandra
pachysandra