Blue Blaze
From the Super Mario Wiki
Blue Blaze is a white normal ghost encountered in Luigi's Mansion and are Blue Twirlers with water protecting their thirty-HP hearts. They are normally found only in the Safari Room, in the east wing of the third floor of the mansion, although one is encountered in the Tea Room during the blackout. The Blue Blaze has a massive earthquake attack that costs Luigi ten HP, as with its non-elemental counterpart. Ice is the key to a Blue Blaze's heart. Being weakened by ice, it completes the triangular Elemental Medal relationship also found with the Temper Terror and Flash.
