From the Super Mario Wiki, the Mario encyclopedia
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Super Mario series
Super Mario World
Boo Buddy Blocks first appear in Super Mario World. When looked at, it seems to be a normal, gray block, though with a unique stone design. When Mario takes his eyes off it, however, it slowly begins to transform into a Boo and follow him. They are actually required to clear a certain Ghost House, Choco-Ghost House, as Mario must lure them towards him, turn around, and jump on and leap off them to reach a high ledge, where the exit door awaits.
Super Mario Sunshine
In Super Mario Sunshine, Boo Blocks are known as Pink Boos in English, and bear a resemblance to Red Boos due to their color. Like normal Boos in this game, they do not care in Mario looks at them, instead only turning into a Ghost Block if sprayed with F.L.U.D.D.'s water or a Yoshi's juice. The Ghost Block looks very similar to Yoshi Platforms, though their eyes can still be seen on one side. After a lengthy period of time, they revert to their normal form. When not a block, they meanderingly patrol a small area in a similar manner to the Boos in the game, though in a less wide range. They appear solely in Hotel Delfino, specifically around the central pillar in The Hotel Lobby's Secret and over a large pool-like bathtub under an air vent in Mysterious Hotel Delfino.
Boo Blocks return in Yoshi's Story. They appear solely in Stage 6-3: Ghost Castle. Their Ghost Block form is redesigned with pink and white stripes rather than being a solid gray block. In addition, they take a different appearance from normal Boos when Yoshi is looking away.
Super Mario World: Mario to Yoshi no Bōken Land
In Super Mario World: Mario to Yoshi no Bōken Land, when the Boos turn into Ghost Blocks, they still show their face, unlike in the original game, where their faces disappear.
Names in other languages