Burnerman is a Dark Loid navi, under the command of Shademan. Burnerman is very unique in the aspect that he is the first navi to be introduced in the anime, before being revealed in the game version (in this case, Battle Network 4/ Rockman.EXE 4). His operator from the game, Atsuki Himura, is not present in the series.
Burnerman is one of those kinds of characters that very much enjoys being evil (having been dubbed by fans as the rabid cupcake). He has many accessable flames on his body, making him a very dangerous foe.
Source: Rockman.exe Online