Dizzy is the last boss of this game therefore making her pretty much superior on average to most of the other characters. The only problem with her is the accuracy of her attacks. Many of them can be in accurate at times which can be a real pain. If you learn to use her special attacks in combination with everything else and constantly use her special moves, then you should have no problems using her.

Moves List

Undine's Flame Scythe - QCF+S
Undine's Ice Spike - QCF+HS
Undine's Homing Spear - RDPM+S
Undine's Ice Creature Assistant - QCB+P/K/S/HS (P = A biting attack that starts off by traveling a short distance then continuing for 2 more bites at very short movements. K = A biting attack that starts off by traveling a long distance then does two more bites each traveling at a very short distance each. S = Stays in front of Dizzy acting as a shield. Can take one hit or will attack 3 times before disappearing. HS = Will move a short distance with one bite and then shoot a laser out of it's mouth while flying upwards a bit.)

Overdrive Attacks

Shockwave Explosions - HCB,F+S
Necro Arrow - DF,HCF,B,F+P (The start is unblockable. If the start catches the opponent, the they will be hit by the rest of the super. The start is on the ground, so it can not hit them in the air.)
Necro Gamma Ray - F,B,F,HCF (Requires a full tension gauge.)

Instant Kill

Dizzy does not have an instant kill.

Combos

K, S, HS, QCF+HS
Follow what the combo says and you'll have a 4 hit, high damage combo.

Guilty Gear Mode Changes

Two air dashes now. She can combine them with her two air jumps also. That's about all.

Gold Form Changes

Very strong now. You thought that she was strong before. Now she can drain your life in no time.