“First I shall defeat you, and then I will present to King Bowser an iced Mario gift!”
The Crystal King guarded the last Star Spirit, Kalmar, in the Crystal Palace. Crystal King's body is invisible and he can also make his cloak and crown invisible too. Crystal King can fly, summon Crystal Bits and shoot ice beams. When he gets desperate, he begins copying himself and recovering HP.
When Mario defeats him, Crystal King says, "Oh no! The last Star Spirit!! King Bowser, forgive meeeeeeeee!!". He then spins out of control and disappears while sparks are flying away from him.
Like the other characters, Crystal King appears in the parade at the end during the credits. Two Duplighosts are impersonating him, and the real Crystal King is carried away by his Crystal Bits.
Tattle Log and Statistics
The Crystal King is incredibly powerful. If not beaten quick enough, the Crystal King will recover 20 HP at least three times. He can attempt a freezing attack which freezes Mario and also deals six damage if not blocked. The Crystal King can split into multiple copies of himself in the air or on the ground. If Mario does not choose the correct copy on the next turn, the king will unleash a powerful mist attack which deals eight damage.
Crystal Bits are jewels that belong to the Crystal King. There are three different looking Crystal Bits (one shaped like a cube, one shaped like an octahedron and the last in the shape of a sphere) but their shape does not affect what they do compared to a different shaped crystal bit. They assist him in his battle with Mario during the events of Paper Mario. They can be destroyed quickly with a multi-hitting attack, like the multibounce, Lakilester's Spiny Surge, or Thunder Rage. Crystal King can summon them several times throughout battle, using up a turn.
Although they are easily defeated, it is more advantageous to leave them in the battle because when they are gone the Crystal King will shoot a bolt of ice at Mario, dealing 8 damage and possibly freezing him. If properly defended against, the barrage of Crystal Bits can do significantly less damage.
Names in Other Languages
The Crystal King also makes an appearance in issue 27 of Super Mario-Kun. Before the fight, the Crystal King announces his presence using Ice Bolt by freezing Kooper. The Crystal King borrows his attacks from the original game such as hurling Crystal Bits and creating duplicates of himself. After an assortment of attacks, including Mario's using smelly clothing, Kooper uses a flaming shell to defeat the Crystal King.