This has probably been done before (forgive me, I'm new).. if so, just consider it an "updated thread"
The list of MK fighters, new and old, that I have run into are:
Baraka
Blaze
Bo'Rai Cho (duh..)
Darrius
Dairou
Drahmin
Rain
Reiko
Sonya
Johnny Cage
Jax
Smoke (human)
Noob Saibot
Shang Tsung
Reptile (masked ninja form) ..all he ever says is "Leave me be!" ?
Frost
Dark Raiden
Raiden (regular)
Kano
Kira
Nitara
Hsu Hao
Shinnok
Fujin
Jarek
Li Mei
Hotaru
Quan Chi
Sindel
Liu Kang
Sub Zero
Scorpion
Jade
Tanya
Ashrah
Havik
Mileena
Nightwolf
Kobra
Ermac
Mokap (whooped his ass in Edenia)
Kenshi
Kitana
Most of these are no-brainers.. but I wonder what about the characters I have not run into.. which include:
Sheeva
Stryker
Sektor
Cyrax
Kai
Goro
Kintaro
Motaro
Shao Kahn
Kung Lao
Mavado
I know, by reading through some other posts that a couple of the characters on this last have been found by others and I figure that Kung Lao is probably in the White Lotus part of konquest (which I missed, but just found out you can reaccess that part of konquest in Earthrealm, G-6 by defeating Jax, who blocks your path on a bridge).. but do tell if you know where to find some of the characters on this list you have found while running about.

Please include a spoilers warning when revealing Konquest mode information. ~Crow~