SharkMan.EXE

SharkMan.EXE is the NetNavi operated by Masa or by his alter ego Commander Beef in the anime. SharkMan.EXE is quite powerful, with the attack "Fin Cutter". In the anime, he is only seen when Masa is under the alias of Commander Beef, as Masa has denied having a Navi.

Description
SharkMan looks, of course, like a shark, but has no tail and instead has two legs, on which he can stand and fight. He is not a particularly large Net Navi, and his hunched back makes him look even smaller. But he is powerful, and in Episode 5 of MegaMan NT Warrior, when encountering MegaMan.EXE and Glide.EXE, he leaves a good impression on them, with MegaMan telling Glyde that he thought that SharkMan "was only a legend". His main attack is fin cutter in both the game and the animated series.

MegaMan Battle Network
SharkMan is an optional boss operated by Masa.

MegaMan NT Warrior
SharkMan first appears when the WWW organization opens the locks at the aquarium, allowing all of the robot fish to escape. Glyde and MegaMan try to stop it, but they are overwhelmed by a Jellyfish virus. However, SharkMan helps them defeat it. Apparently, he is known as a legend in the Cyber World.

In the beginning of the N1 Grand Prix, Masa (under his alter ego of Commander Beef) enters SharkMan into the competition. He stalls his match against WhaleMan to allow Lan to master the Program Advance.

Manga History
In MegaMan NT Warrior (manga by Ryo Takamisaki, SharkMan.EXE is well known among TV press as a powerful navi who have won various Netbattle Tournaments. In the last tournament he won, he is annoyed by the absence of two geniuses whom defeat WWW (MegaMan.EXE and ProtoMan.EXE), as to fight them is his only motive for entering the tournament in the first place. Some time afterwards, Masa arrived in Den City and make a Big Sale on his fish wagon. Dex Oyama is present to win the free fishes, but was stomped by adult ladies. Masa asked Dex if he know where the genius (Lan) lives, but Dex pretends to be 'the genius' and confronted by him in a Netbattle. Leaving Roll.EXE to help GutsMan.EXE survives the battle, Mayl Sakurai soon called Lan to rescue Dex. After realizing he has been tricked, Masa orders SharkMan to finish Gutsman off, where MegaMan fights in his best friend's stead using the new original chip Lan made: Rock Booster. Although have some difficulty in mastering it, MegaMan finally beats SharkMan and Masa congratulates Lan by giving all the fishes in his cart for free. After Masa left, Lan realized there are still many strong fighters in the world and motivates MegaMan to train harder. Meanwhile, Miyu is watching them from behind...

Trivia

 * SharkMan is one of the few Navis not have a Robot Master counterpart. In Mega Man 3 (PC), there is a Robot Master named Shark Man, but he bears no resemblance or relation to Sharkman.EXE.