|Ultra Boo/Ultraboo/Hyper Boo|
|Full Name||Ultra Boo|
|Gender||Male and Female|
|Ability/ies|| Turning anything into stone|
|First Appearance||Mario & Luigi: Crystallized Chaos (2013)|
|Latest Appearance||Mario & Luigi: Crystallized Chaos (2013)|
|Family and Relations|
They are gray, spiky tailed ghosts that resemble that of the Boos.
These Boos betrayed King Boo and are banished to Fantasy Forest. Their empreor keeps the throne so everyone in the forest can worship him. King Boo notices this and starts a rebellion at the forest. However, the Hyper Boos are always emerged victorious. They help Mario and Luigi and Bowser to push away the Chaos Crystal in their first appearance.
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