Lava Bubble (blue)
From the Super Mario Wiki
Ads keep the MarioWiki independent and free :)
The blue variant of the Lava Bubble, also known as Fire Bubble, first appears in Super Princess Peach in Bowser's Villa. They jump out of blue lava and follow Princess Peach. They can be defeated if they touch a cup. Like Beach Koopas, Blindfold Boos, and Security Thwomps, they do not appear in the in-game glossary.
These Lava Bubbles reappear in Super Mario Galaxy. They resemble Li'l Brrs, but are fiery instead of icy. The only way to defeat them is to shoot Star Bits at them, and they release one coin. Blue Lava Bubbles are first encountered in Good Egg Galaxy during King Kaliente's battle. King Kaliente, after taking a second hit, summons several of them. The blue Lava Bubbles bounce and follow Mario, which can burn him and potentially disrupt his returning coconuts at King Kaliente. King Kaliente also spawns these blue Lava Bubbles during a rematch in King Kaliente's Spicy Return in Bowser Jr.'s Lava Reactor, although these enemies are found in the level prior to the fight. Finally, the blue Lava Bubbles appear in the Melty Molten Galaxy, guarding a Silver Star in Burning Tide and guarding Star Chips in Through the Meteor Storm.
Names in other languages