Millia, on contrary to poplar belief (and take my word on this one since I've spent hours trying to prove my own theory wrong), is the 2nd fastest character in the game. She is not the fastest and her abilities to combo fall short of best also. Still, she is really fast and she can do some long combos although they aren't that great and there isn't much variety to them due to move restrictions. She is a close range character being the good for hit and run tactics. She can not win in a long range battle, although she might be able to survive due to her Tandem Top. Use her as a combo character, or better yet, use her superior, Chipp.

Moves List

Lust Shaker - S rapidly
Maximum Velocity Fall - (in air) QCF+K (Does not hit the opponent and you can be hit out of it easily.)
Tandem Top - QCF+S or HS (HS version takes about a second longer to activate but last for about 3 seconds more.)
Bad Moon - (in air) QCF+P
Forward Roll - QCB+K
Iron Saber - QCB+P
Secret Garden - QCB+HS then any direction plus HS as many times as you can before it launches off.

Overdrive Attacks

Winger - QCB,HCF+HS
Emerald Rain - QCFx2+S

Instant Kill

Press All 4 Buttons to activate the "Attack Mode" then while in it:
Iron Maiden - QCFx2+HS (This will target the opponent. They can't avoid it, they can only block it.)

Combos

P, K, S, HS, QCF+S
This is a basic combo. Just follow what is up there and it should work. Make sure that you're not holding forward since it will mess this combo up slightly making the timing really odd and the speed of the first strike really slow.

Guilty Gear Mode Changes

She becomes faster, but she's till slower than Chipp. She can now Air Dash twice and she has two air jumps, but it's hard to combine the two like Dizzy can.

Gold Form Changes

Unknown at this time.