Subverted: Bob only bans characters on the game's official ban list...
Double Subverted: ...which he typed out himself and printed off ten minutes before Alex came over.
Bob finds a "Game Breaker" somewhere everywhere, everytime someone beats him in any way, even if it's real life. "Game Breaker! You have a bigger spoon than me to eat your breakfast cereal faster with!" "Game Breaker! You're taller and have longer legs so you can run faster than me!"
Zig Zagged: Bob only bans characters on the game's official ban list... which he typed out himself and printed off ten minutes before Alex came over. However, he'd typed it out from his best memory of it, and the retyping is accurate. To an old and outdated version of the ban list. Bob didn't use the latest banlist (freely available on the internet) because it banned Charlie and unbanned Daniel.
Averted: Alex plays against Bob according to the game's programmed rules.
Enforced: "We want to show how annoying Alex's new roommate is. Let's make him a sore loser when they play video games."
Lampshaded: "So every character you lose to is a Game Breaker now?"
Invoked: Bob wants to impress his girlfriend with his "leet skillz". But Bob knows that Alex always wins when he plays as Daniel. So Bob tries to ban Daniel to try to save face.
Defied: Alex tells Bob to shove his ban-list and his whining, or he won't play.
Discussed: "Wow, Bob, you're really starting to sound like a scrub now."
Conversed: "Does this Bob guy have Sore Loser written all over him,or what?"
Alex continues to defeat Bob, even when using characters Bob thinks are fair, including winning in several Mirror Match rounds. Bob realizes his (lack of) skill is at fault, not Game Breaker characters, and either works hard to improve, or gives up Generic Fighter II.
Bob works hard to improve... against AI opponents. When Bob thinks he's good enough, he invites Alex over for a rematch. Alex quickly finds and uses a counter-strategy to Bob's new strategy... which Bob quickly begins calling overpowered.
Alex grows to miss playing Generic Fighter II against Bob, and agrees to some of Bob's house rules so that they can play together again. Within minutes, Bob's pushing his house rules further and further.
Played For Laughs: The Exaggerated scenario above happens. Wimp Fight ensues... and Bob claims that Alex's hair pulling is a Game Breaker.
Played For Drama: Generic Fighter II is Serious Business to Bob, and he tells himself constantly he can't afford to lose to Alex any more, while trying harder and harder to force his house rules onto Alex. The stress threatens their friendship, as Alex threatens Bob's view of himself as the greatest Generic Fighter II player in the 'hood, and Alex is getting pretty sick of Bob's attitude.
Back to Scrub - and bring a fair tactic this time!