Rockun is a recurring enemy character in the Bomberman series.
Rockun appears disguised as a Soft Block (which are boulders in Rockun's area). When Bomberman approaches, or if it is hit by a bomb blast, it will make itself visible and move about slowly and randomly. Unlike its counterpart, Trent, it will eventually stop moving and go back into its Soft Block form. It takes one bomb blast to destroy (while active), and is harmful to touch.
In Bomberman '93, it is not disguised when it is dormant, but it is still impervious to explosions.
In Bomberman '94, it is not disguised when it is dormant, and it is always susceptible to attacks.
It normally appears in rocky areas, but in Bomberman Portable it appears as a semi-common enemy, disguising itself as other world blocks.
1. Super Bomberman 3 Hudson Soft Guidebook, pg. 27
2. Bomberman Story Official Guide Book, pg. 62