Game:Ursula

Ursula is one of the bosses in the world Atlantica. Fighting her is made possible in Kingdom Hearts and Kingdom Hearts: Chain of Memories, but in Kingdom Hearts II, the combat is replaced by a song sequence, Ursula's Revenge.

Kingdom Hearts
The first encounter with Ursula is in Ursula's Lair.
 * First encounter

Ursula has stolen King Triton's trident, but does not use it in this battle. Rather, she fights by swinging her hands and tentacles, and every now and then, she will spin vigorously round the room, injuring Sora and company if they come near. Flotsam and Jetsam are also in the lair to deal damage to Sora - Sora should take them out first using physical attacks (their HP is rather low), and then concentrate on Ursula.

It should be noted that in Ursula's lair, there is a huge cauldron in the centre, filled with colour-changing liquid. If spells are cast at the cauldron often, the cauldron will emit flames and stun Ursula for a period of time. The colour of the cauldron does not indicate what kind of spell it needs to be used on it. Launching spells at the cauldron will eventually cause a massive amount of energy to be released, stunning Ursula and her lackeys. You may lock on to the cauldron to cast the spell, though it should be noted that physical attacks will not work on the cauldron. If you are low on MP, make sure to attack Flotsam and Jetsam, who release MP orbs.

Once Ursula is stunned, take this opportunity to use physical attacks on her.

Her attacks are few but rather unpredictable, so the key to winning this battle is the cauldron at the center of the lair to incapacitate her. Also remember that after a period of time, Flotsam and Jetsam will be periodically revived and will come after Sora to deal damage to him, so take them out while they are still alive. Like all other boss battles, do heal when necessary.

Ursula can be found in an area hidden beyond the Calm Depths (marked with "???"), where the water currents might push Sora away - use your newly acquired ability Mermaid Kick to get to that area. In this area, Sora and company will confront a gargantuan Ursula, this time, wielding King Triton's trident. It should be noted that if Sora uses any form of Aero magic here, this will strengthen Ursula. She deals non-elemental damage which looks somewhat like Thunder (these attacks increase in power and quantity when she raises the trident), and she occasionally blows air currents into Sora's chest, dealing substantial damage to him. When she has only one HP bar left, Ursula can open her mouth to deal a Thunder-like attack, which will damage Sora if he gets in the way.
 * Second encounter

Her only weak point is the head, so it is best to use physical attacks on it. Occasionally Ursula will push Sora away from her head, so get as close to her as you can. Don't be shy about using the Keyblade - and do heal when necessary. Aim for the back of her head and attack from behind as much as possible. However, since Ursula is always turning to face you, this makes it difficult to hit her. When she starts to gasp as if hurt or tired, swim behind her head and chain combo attacks to the side or back of her head, and swim away when it starts to get dangerous. Magical attacks can damage her as well, but normal combos work best, since she has a triple HP bar.

As Flotsam and Jetsam have already been eliminated after the first battle, you do not risk being damaged by any of them in the second battle.

If you’re in front of Ursula when she starts to inhale water, use Mermaid Kick to swim away as fast as possible until she can’t inhale anymore. If you don’t, she’ll bite you. Not fun. She always declares her other attacks - a bubble attack (avoidable with Mermaid Kick) and raising the trident indicates that she’s going to form a circle of damaging magic around her. Swim away to avoid that one. Your prize for winning is the Thundara upgrade and another Ansem’s Report.

Kingdom Hearts: Chain of Memories
Sora's encounter with Ursula is on some sort of pedestal on the water surface, and again, Sora fights a gargantuan Ursula.

Note that while Ursula is alert, most sleights do not work on her, so it is best to use melee attacks. It is recommended to stock cards from numbers 7-9, as well as a few Cure cards - and if you do have place for more cards, fill it with 0 cards in order to break Ursula's attacks. You might consider getting Premium Bonuses for all cards as they reduce the cost points of each card (especially for cards 7, 8, 9 and 0), allowing room for more cards on the deck.

The Trick Card, if found and used, would cause Ursula to choke, and be stunned for a period of time. It is then and only then that Sora may use Sleights on her. However, the time period is rather short - you can only perform seven melee attacks (or two sleights) before she is back to form. Be prudent during this battle, and heal when necessary. Alternatively, you may use the Search Ghost enemy card to drain out Ursula's HP - every hit you make gives you some amount of HP, or use the Oogie Boogie enemy card to heal yourself tenfold.

You may use the same strategy while playing as Riku in Reverse/Rebirth, only that this time, you cannot stock up Cure cards - use either one of these cards : Search Ghost or Oogie Boogie to recover.

Strangely in Kingdom Hearts: Chain of Memories, two tentacles must be taken out to harm Ursula but in Kingdom Hearts Re: Chain of Memories it takes all four.

Kingdom Hearts II
As said earlier, here, the combat sequence is replaced with a musical sequence, Ursula's Revenge. There are only two commands to this sequence - a blue circle with (i.e. hit at the right time), and a purple circle with (i.e. hit  as many times as you can to drain out her HP). Successfully executing both these commands will deplete Ursula's HP. You need to bring Ursula's HP down to at least 1/8 of the bar to clear this round (though it is recommended to completely deplete the bar).

It should be noted that in Kingdom Hearts II: Final Mix+, you have to use the in place of.

Battle Quotes
Not very tasty!

Insolent Little...

Is that all you've got?

Get ready for this!

Get Up and fight!

You DARE to strike me?!

This won't be pretty

Now I'm angry, its time to teach you some respect!

AAAAAAAHHHHHHHHH, NNNNNNOOOOOOOOO!!! "Insolent Fools!"

"No, impossible."

Trivia

 * Ursula is the only character in Maleficent's original group that is fought in a nonbattle way in a game. In Kingdom Hearts 2 she is fought in the mini-game Ursula's Revenge.