Drill Man

Drill Man (ドリルマン) was created by Dr. Cossack for underground construction. His weapon, the Drill Bomb, is intended to pierce heavy armor and explode causing as much damage as possible.

Mega Man and Bass CD data
A digger robot for a construction site. He has been given an award for finding a gold mine. "Oops, I damaged the gas pipe..." Good point: Industrious Bad point: Haphazard Like: A rush job Dislike: Calculations 

Stage enemies
Enemies in Drill Man's stage in Mega Man 4 (NES).
 * Boulder
 * Battonton
 * Bug Copter
 * Helipon
 * Jumbig
 * Met EX
 * Mono-Roader
 * Pakatto 24

Enemies in Drill Man's stage in Mega Man III (Game Boy).
 * Boulder
 * Battonton
 * Count Bomb
 * Hammer Joe
 * Helipon
 * Jumbig
 * Met EX (jump)
 * Pakatto 24
 * Shield Attacker

Other media
Drill Man appeared in episode 3, 16 and 20 from the Mega Man animated series and had a action figure. He also appeared in the manga Rockman Megamix.

Trivia

 * Contrary to popular belief, Drill Man isn't an upgrade of Crash Man, because Crash Man was a bombing robot, and Drill Man was built purely for mining purposes. They also had different creators. However, both robots do have drill-like hands, as well as a green orb on their chest. Their similar overall design means that Drill Man's design was likely inspired by Crash Man's. Of note, when Crash Man's name and appearance was being decided, Drill Man was one of the names suggested.
 * Ground Man was originally called Drill Man by his designer, Iwamoto Yoshihiro, but his name was changed because there was already a Drill Man.