Blue
Ravenous Bugblatter Beast of Traal
I understand you, I just didn't planned a good immortal option in that version yet. I think that line is funny, because until immortal reach level 14, he is way easier to kill than other options. But good luck.
Human v yo get medium armored feat could make you way less mortal, don't stat in melee too. And don't waste your discipline with celerity.
Other option for medium armor is to play a Mountain Dwarf. The +2 STR/+2 CON can be used, as well as the weapon proficiencies. And who doesn't like darkvision.