Yeah Jade...She was a cheap Bi**h in Trilogy. Always using her invincibility and crap...always at the right time.

In MK1 = Endurances and Goro
MK2 = Smoke
MK3 = Sheeva
UMK3 = Jade
MKT = Jade & Sheeva
MK4 = Goro

Mk1: Johnny Cage
Mk2: Mileena and of course Jade
Mk3/3Ultimate/Trilogy: Johnny Cage and Jade
Mk4: Tanya and Shinnok
MKDA: Sonya and Quan Chi

I'll have to say Jade also.

MK2: jade,smoke and Kintaro.

jade

nightwolf was tough too. he had that cheap kick to the knee (that he usually does before his combo) that always gets you even if you try to jump.
Jade as sum1 mentioned above too had that projectile invinciblity.Reptile is useless against her as he only had projectiles for his arsenal.
Kintaro was one tough boss! the amount of credits i used on that guy was a joke!

Jade from UMK3/Tril without a doubt. That projective evade was sooooooooo anoying. Noob Saibot and his teleport slam soon sorted her out though :).

MK1: Goro/Reptile

MK2: Jade/Kintaro

U/MK3: Shao Kahn/Motaro

Trilogy: Jade/Kahn/Motaro

MK4: Goro

MK:DA: Quan Chi/Moloch (on Certain Circumstances)

MK1 = kano
MK2 = jade
MK3 = motaro
UMK3 = jade
MKT = jade
MK4 = goro
MKDA= movado

Actually yeah, Motaro was a bit of a bitch to beat in the hardest difficulty level in UMK3. They seemed to make the bosses harder from MK3 to UMK3.

I'd have to say the hardest character for me to beat ever was "Jade"

She's a vicious life sucking bitch from which there's no escape!!!


Kintaro is very hard too , he's a 4-armed freak from hell from which you'll get "NO" mercy!!!

MK1: Subzero
MK2: Llu Kang
MK3: Sheeva
UMK3: Jade
MKT: MKII Rayden
MKG: Jarek
MK4: Rayden
MK5: ?????

jade (hidden mk2 character) is very easy to defeat. I always get flawless victorys against her.
The best Character against that type of character is RAYDEN.

here goes:
Mk:reptile
MK2:Kintaro
MK3:kano
Umk3:same as MK3
MK4:Dunno
MKGold: havent touched it
mkda: not released yet in oz

MK Trilogy: Kano

Hmm
MK1 - No one
MK2 - Kitana, Kang, occasionally Sub Zero, when he does his first freeze, he just can't stop. And the secret chars of course.
MK3 - Kang, Kahn (duh)
UMK3 - Jade
Trilogy - MK1 Raiden + Kano
MK4 - No one
MKDA - Once again, europe.

MK1: Probably Goro or maybe Shang Tsung...not sure on that....
MK2: All of the secret characters, especially Jade, and Kintaro
MK3: Motaro
UMK3: Jade, Motaro, and maybe Shao Kahn
MKT: Jade
MK4: Goro
MKG: Haven't played it, but it's just like MK4, so I'd probably say Goro
MKDA: I have only played the GBA version.

MK1: Goro
MK2: Jade
MK3: Sheeva
UMK3: Jade/Shao Kahn (SK because of the crappy AI, using only 2 moves: Fireball and knee)
MKT: Noob Saibot
MK4: Tanya

MK1: (Human) Cage
MK4: (Computer) Tanya
MKDA: Haven't got it yet.

MK1 - Sonya.
MK2 - Don't play it much.
MK3 - hmm, dunno.
MK4 - all easy, Shinnok is not as easy though.
MKDA - Turd Chunk (Hidden character, only on PS2)

In MK1 and 2 all the characters had their share of annoyingness. In 3 you could roundhouse them everytime they walked or ran in with anyone. In Ultimate there was an AI break for just about every character in some way. Which is why these games are really only fun against OTHER people.

Kintaro in MK2 I beat him once I think everytime else I beat him the first round and close the second he's just too cheap and everything.

kitana or mileena in mk2. When they were high up the order you couldn't hit them because they didn't stop using throws.