I played with him in the Tekken games, so I'm starting with him and Blanka

. Each fighter has like 150 moves EACH in the Tekken games, so I was wondering how Capcom would cram them in. Theres the 3-4 special moves, then they tucked 3-4 more moves in the "unique moves" category, which is hitting the directional+an attack button.
Jack X's specials are the bolo punch, earthquake fists to the ground, shoulder rush, and rocket uppercut. Unique moves is where they were able to cram in the Cossack (russian dance) Kicks, and his flight move

.
You can fly in the air, and instead of the stomp when you land, he comes crashing down on his butt

. The Cossack Kicks have odd timing, but once you get used to the slight delay in the second input it comes out easily. Down+light kick, then MK-LK-MK-LK...theres a slight delay before you're supposed to hit MK after the down+LK. One of my favorite Jack moves in Tekken, but that delay will hurt me against online players who like to crowd you and do billion hit combos

.
He's got a couple "keep away" moves, that help keep annoying combo mashers that love Capcom fighters...out of the close range that they prefer. I call them "poke" moves. Down+LP leads to a combo if HP is linked after it. HP and HK are powerful pokes as well. His LP earthquake will punish combo crowders too.
Capcom is really caught up in this 2-3 VS 2-3 thing

. It makes it hard to memorize the moves

! How I get around this is, I pick one character with diverse commands, and his partner is a simple charge move guy like Blanka or Balrog. Makes it easier to play both fighters to their full potential.
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Before you ask about the username, I'm a reformed Sega phanatic from the Sony-Sega wars! I accept Sony now, and I even own a PSP

!