These unused player sprites were found in the game's tiles by ACE_Spark.
Recently, it has come to light that the endingless Megaman Soccer, actually has an ending!
These ending sprites were ripped thanks to a Game Genie code by Kung Fu Furby. It can be found here.
For the record, the widly assumed unused 8bit style Robot Master sprites ARE used,
and are found in the Players section.