From the Super Mario Wiki
Temper Terrors are a normal elemental variety of the Gold Ghost in the game Luigi's Mansion. These light blue ghosts have fireballs protecting their hearts. Temper Terrors appear in the 2nd floor Washroom and the Sitting Room, although a few Temper Terrors appear in the Bathroom and Boneyard during the blackout. In order to expose their heart, Luigi had to shoot water from his Poltergust 3000 (after vacuuming a Water Elemental Ghost) at the Temper Terror, dousing the fire surrounding the heart to make the ghost vulnerable to the Poltergust 3000. The Temper Terror has a punch attack, identical to the one used by the regular Gold Ghost, which should be dodged. They are one of the few non-portrait ghosts that are completely optional to encounter.
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