Ky is the average character. His capabilities to string moves together are horrible though so don't expect to pull out big, long massive combos without the help of the Dust Attack. He is a worthy character to be used since you can be an excellent tactition to win easily.

Moves List

Stun Edge - QCF+S
Charged Stun Edge - QCF+HS
Aerial Stun Edge - (in air) QCF+S or HS (Each gives a different angle)
Vapor Thrust - DPM+S or HS (OK in air)
Stun Dipper - QCF+K
Crescent Slash - QCB+K

Overdrive Attacks

Ride The Lightning - QCB,F+HS

Instant Kill

Press All 4 Buttons to activate the "Attack Mode" then while in it:
Rising Force - QCFx2+HS

Combos

QCB+K, DPM+S or HS
This is simple two hit combo that will send the opponent far away from you also since it launches them high into the air.

Guilty Gear Mode Changes

Ky is the only person who really feels the changes of this mode. Ky becomes known as Gear Ky. He is slightly faster, but his abilities to combo become horrible. All of this moves become hyper fast. Some of his moves have changed too.
Charged Stun Edge becomes a set, shockwave like, wall.
Stun Dipper becomes a really fast dash forward with a slash.
Crescent Slash reverses it's motion. Instead of slashing in a half circle downwards, Ky now jumps into the air and attacks from the top slashing in a half circle upwards motion. This is faster than the regular Crescent Slash.
Ride The Lightning is now hyper fast and hits for one hit no matter when the opponent gets hit by it. That one hit does massive damage, more so than if you hit with the entire old Ride The Lightning.
His Vapor Thrust changes a bit now. Only the Vapor Thrust with Slash will be a normal use. Ky gains a new overdrive by the command of DPM+HS. It acts as a Vapor Thust-Ride The Lightning combination.

Gold Form Changes

Unknown at this point of time.