Serial Number: DWN-023
Designer: Dr. Light & Dr. Wily
Weapon: Spark Shock
Spark Man's deisgn is a little more direct than almost any other Robot Master: his body is a giant spark plug. There's no beating around the bush. This guy is all about electricity. There's also another quirk of his design. While his character portrait on the Stage Select screen does show his face in fleshtones, his in-game sprites don't. Because of NES sprite limitations, his face is shown as a black void, similar to Sniper Joe and Metalls.
On a side note, his background information states that he can generate twice the power of Elec Man. That's somewhat expected, seeing as Spark Man is a later model, and thus would be using newer technology. However, it turns out that he's not able to really focus this increased output, which explains why his attack scatters in multiple directions and does much less damage than Elec Man's attacks.