May is a horrible character to use if you are new to the game. Against a newbie or the computer maybe, but try to avoid using her if you are going to face anyone with experience. Only people who are experienced on how to use her should do so. Her biggest problem would have to be he recovery time on her moves. This is made up with the long range of them and also the power. You can cover for her recovery time by using the Applause For The Victim effectively, but you better be experienced.

Moves List

Mr. Dolphin! Horizontal - [B],F+S or HS
Mr. Dolphin! Vertical - [D],U+S or HS
Restive Rolling - DPM+S (While in it, you may input up to 3 extra commands by using a direction and hitting S again. This will make her roll somewhere else. She will move about hald screen range each time. If she hits the floor this will end.)
Applause For The Victim - HCF+P/K/S/HS (Each button will set the ring up at a different place. P will be over May's head while HS will be on the other side of the screen. K and S will place it in between each with K being closer to May and S being closer to the other end of the screen. Hold the button to delay the release time and charge the move up. At certain charge times, one more dolphin will come out of the ring.)
Overhead Kiss - HCB+K (close)

Overdrive Attacks

Ultimate Whiner - HCB+HS
Great Yamada Attack - QCFx2+S

Instant Kill

Press All 4 Buttons to activate the "Attack Mode" then while in it:
May And The Jolly Crew - HCFx2+HS (close)

Combos

[B], P, K, S, HS, F+HS
This combo is simple. As you are doing the 4 hits, hold back and after the HS, hit forward and hit HS again for the Mr. Dolphin! Horizontal to activate.

Guilty Gear Mode Changes

Nothing special. Just the normal stat. ups like everyone else. It seems that her in the air S and in the air HS have changed although this is not completely confirmed.

Gold Form Changes

Unknown at this time.