Okay so for my homebrew the party could come up against a NPC member of the Organization they're chasing next game, and in this case he's meant to be as crazy and twisted as possible. Barely resembling an Elf, he's a twisted abomination, who takes pleasure in defiling those he captures with his sick experiments.
To that end, I've picked as many horrific alchemist things as I could take; and Vivisectionist just makes sense. However I could use some help with feat/discovery selection if possible, since it's not strictly optimization and I'm not too familiar with the class. For the record though I want him to be effective & resilient, but creepiness trumps effectiveness.
Level 13 Elf Vivisectionist
His stats(20 pt buy)
STR 10
DEX 16->18(r)->20(lvl 8 & 12)
CON 16->14(r)
INT 14->16(r)
WIS 9->10(lvl 4)
CHA 7
Feats:
1 - Weapon Finesse
3 - Extra Discover(Tumor Familiar)
5 - Die for your Master
7 - Extra Discover(Vestigial Arm)
9 - Extra Discover(Parasitic Twin)
11 - Extra Discover(Greater Mutagen)
13 - Extra Discover(Bleeding Attack<the Rogue talent>)
Discoveries
2 - Spontaneous Healing
4 - Preserve Organs
6 - Preserve Organs
8 - Vestigial Arm
10 - Mummification
12 - Wings
Between the apparent fast healing, mummified appearance, his extra arms, his talking tumor buddy, Insect Wings, and his creepy deformed twin... I think that he should be fairly imposing if nothing else. Anything I'm missing?
On the effectiveness end, He can pump his dex with his mutagens and all his extracts are going to himself. Flight gives him a good escape option, Fast Healing gives him staying power, and preserve organs and die for your master will save him from lucky crits.