Crenel Hermit

The Crenel Hermit is a secretive figure who resides high up on Mount Crenel in The Minish Cap. His cave abode is built into the Crenel Wall section of the mountain. Upon meeting Link, he notes that specific patterned walls about the face of Mount Crenel are susceptible to bomb explosions, yielding secret passageways that ultimately hide Rupees and Pieces of Heart, among other rewards. The young hero may figure out the secret of these walls without consulting the Hermit, however, making this meeting entirely inconsequential to the plot of The Minish Cap, either way.

Link can fuse Kinstones with him, as well.

Trivia

 * He boasts about winning the Picori Festival Tournament back when he was a kid.
 * The Crenel Hermit is a neighbor to the Great Mayfly Fairy, living right next door to its Fairy Fountain.