Amazing Flyin' Hammer Brother
From the Super Mario Wiki
The Amazing Flyin' Hammer Brother (alternatively spelled as Amazing Flying Hammer Brother, and also shortened to A. F. H. Bro in the in-game glossary for Super Princess Peach) is a special variety of Hammer Bro that first appears in Super Mario World.
Super Mario World
In Super Mario World, Amazing Flyin' Hammer Brothers are first encountered in Donut Plains 4. They hover around on a platform composed of two gray Rotating Blocks with wings on each side that swings back and forth. Amazing Flyin' Hammer Brothers attack by tossing hammers from their swooping platform, and can be defeated by various methods, most commonly hitting the platform from below; they can also be defeated with a stomp or fireball, though the hammers make it somewhat difficult to do so without taking damage. When the Amazing Flyin' Hammer Brother is defeated, the flying platform remains on-screen and continues on its original flight path; however, if the platform's rider is somehow defeated before the platform itself begins to move, it instead stays in place.
During the enemy cast roll in the game's credits, the Amazing Flyin' Hammer Brother's platform is depicted with gray Empty Blocks instead of Rotating Blocks.
Super Mario Advance 4: Super Mario Bros. 3
In Super Mario Advance 4: Super Mario Bros. 3, a lone Amazing Flyin' Hammer Brother appears near the beginning of the World-e level Slip Slidin' Away. It retains its appearance and behavior from Super Mario World.
Super Princess Peach
Amazing Flyin' Hammer Brothers make a reappearance in Super Princess Peach, retaining their appearance and behavior from previous games. They only appear in Giddy Sky. The game also introduces a sleeping "Calm" variant called a C. A. F. H. Bro, which is comparatively more common. Strangely, Peach can instantly defeat the enemy by simply touching it if it is close enough to the ground.
One Amazing Flyin' Hammer Brother appears in the Nintendo Adventure Book Dinosaur Dilemma, capturing the remaining dinosaurs in Dinosaur Island while they, Mario and Yoshi are looking for food near Lake Trilobite. The Amazing Flyin' Hammer Brother threatens to capture Yoshi as well, but is scared off by Mario.
On the board of the original version of Nintendo Monopoly, an Amazing Flyin' Hammer Brother can be seen in a Super Mario World screenshot.
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