Dr. Cossak

Cossak (コサック) is a character from MegaMan Battle Network 3. He was Bass.EXE's and creator.

Personality
While it was not shown what Cossak was like before the Alpha Revolt, it can be assumed that he and Bass had a close relationship (which could be supported by the fact that Bass did not kill Cossak during their reunion, despite the fact that Bass believed that Cossak betrayed him). In WWW's base, upon learning what Bass had become, Cossak was willing to do whatever it takes to bring him down, even at the cost of his own life. Despite having been spared by Bass' hand, he felt regrets for having created Bass and urges Lan and MegaMan to delete him.

In the MegaMan NT Warrior manga, Cossak's relationship with Bass is explored a little bit more. He was always supportive of Bass and stood up for him, while the other scientists and their NetNavis believe Bass to be a troublemaker. In the unseen story, "Forte x Serenade: The Legendary Battle," the relationship was so close that he referred to Bass as his "precious son." Cossak was also saddened by the fact that Bass was supposedly deleted during the Alpha Revolt, but was also hopeful that he created a program that would let Bass jack-out and transfer to his PET if he was still alive (Bass, however, refused).

Game History
When he worked at SciLab, he was in charge of the project that created Bass. Cossak tried to make an AutoNavi, a NetNavi that could operate on its own without a NetOp but when Alpha began malfunctioning, he was blamed. Bass was assumed to have been deleted but survives. Cossak was arrested but was released at a further point in time.

MegaMan Battle Network 3
Years later, he tries to stop Bass in MegaMan Battle Network 3. Dr. Cossak is seen during the FlashMan arc, at night. If he is talked to, he warns them not to stay out late. Cossak is walking to the ACDC train station when Chisao arrives. He asks for directions but Cossak tells him he has to go to a meeting and leaves. He also appears during BubbleMan's attack, where he helps Lan modifying the PET to allow MegaMan pass by small areas. When MegaMan fights against Bass in the Undernet and is knocked out, Cossak's NormalNavi appears to fight against Bass, being almost deleted, but Bass leaves when Wily called for him saying he has the four TetraCodes. Cossak hears this and suspect they are trying to awaken Alpha. In the WWW's base, Cossak appears to help Lan, Tora, Chaud and Dex. Dr. Cossak explains his past and connections with Bass and then transmits himself into the Cyberworld. He is opening a pathway when Bass arrives and attacks him. In the ensuing battle, Cossak is badly injured. He's taken to the hospital and Lan tells him what happened in Castle Wily. Some speculate that Cossak survived because Bass couldn't bring himself to kill his former partner.

Later, he is briefly mentioned after MegaMan defeats Bass in Secret Area. MegaMan reminds Bass of Cossak. Despite his amnesia, he seems to remember slightly but leaves.

MegaMan NT Warrior
Like the games, Cossak was in the project that created Bass in the MegaMan NT Warrior manga. He appeared in two side stories (one of them that's Japan only) telling of Bass' origins.

Trivia

 * Although he has the same Japanese name from his original counterpart, his name was translated without a "c" in the MegaMan Battle Network series.