From the Super Mario Wiki
Fawful Guys are Fawfulized Shy Guys that wear orange robes and a Fawful face mask. They are found in the events of Mario & Luigi: Bowser's Inside Story; they also have a dark version. They can be defeated by Bowser if he attacks them in the overworld for coins, but Mario and Luigi have to fight them.
They attack in strange ways. One of their attacks involves getting eaten by an offscreen creature that has the tongue of a Yoshi and a roar similar to Yoob, a massive Yoshi monster from Mario & Luigi: Partners in Time. The creature encases them in an egg (making reference to both Yoob and Super Mario World 2: Yoshi's Island) and launches them at the bros. Right before the Fawful Guy is launched, a target will appear showing who they will attack. If the brothers jump on the egg, they can cause significant damage to the Fawful Guy. They can also attempt to headbutt the brothers (jumping ala Woozy Guys), which they have to counter with their hammers. At the climax of this attack, a Fawful Guy will occasionally pull out an umbrella and float towards Mario or Luigi, who can still counterattack with their hammers.
Names in Other Languages
|From Fawful's Japanese name, "Gerakobits", and "Heihō", Shy Guy's Japanese name.
||Pun on Grácovitz (Fawful's European Spanish name) and Shy Guy.
||From Fawful's French name, "Gracowitz", and "Maskass", Shy Guy's French name.
||From Fawful's German name, "Krankfried", and "Shy Guy"