Princess Peach was Crazy-Prepared, allowing her and Prince Peasley to thwart Cackletta's plan to steal her voice before it even began. Pretty badass for a normally Damsel in Distress.
On top of this, the whole plan was a Batman Gambit between the monarchs of the Mushroom and Bean Bean Kingdoms to keep the Bean Star out of Cackletta's hands and put up a trap that almost successfully takes her out. The Bean Star is a wish granting star that would give the user absolute power. You'd expect this star to come into Cackletta's possession and the Bros to have to fight desperately against a godlike Cackletta who managed to unlock it's power. Nope! In a brilliant and very rare subversion of You Can't Thwart Stage One Cackletta never gets access to the Bean Star's power throughout the game and ultimately her plans never really get off the ground.
The Bros. themselves get a Batman Gambit of their own. When the Fake Beanstar ruse is seen right through by Fawful, the duo quickly form a plan: trick Bowletta into thinking the Peach they have is fake with an extremely convincing impersonation from Luigi. Not only does it work, bring Peach to safety, Luigi manages to escape Bowletta's clutches and take back the real Beanstar while he's at it!
Chopper Bros.' incredible strength means that if you pay attention on your BP and ATK stats, you have a move which is devastating to early-game enemies, and downright overpowered on later bosses.
As always, reaching Bowser's Castle is a treat to play through, as you fight your way through all of Bowletta's underlings: The seven Koopalings, and Fawful.
The final battle with Cackletta, which takes place in the hellish landscape that is Bowser's stomach with background music that can be described as nothing short of metal, while the hideous towering abomination that is the soul of Cackletta unleashing lightning, fire, and everything else she has at you in one of the single most epic boss fights in gaming history.
To add on top of this you start the fight with both bros. at 1 HP! It definitely feels awesome to beat her once and for all
Luigi got several of these moments.
The Mario Bros. ambush Cackletta and Fawful at the Woohoo Hooniversity. Fawful tries to get between the Bros. and Cackletta, but Luigi pounds him into the ground with one swing of his hammer, taking him completely out of the fight.
Later on, Luigi knocks Fawful out of Bowser's castle.
Dressing up as Princess Peach to fool the villains, and then making off with the Beanstar, much to Bowletta's fury.
Saving Prince Peasley from a Piranha plant.
After Mario developed bean sickness, Luigi was paralyzed by fear, but thanks to a Hypno Fool making him think he was Mario, quickly regained his confidence.
By the end of the story, the guards who didn't recognize him earlier now call him "Master Luigi".
The reveal of the Remake, which not only updates the game with Mario & Luigi: Dream Team and Mario & Luigi: Paper Jam's graphics but also includes Minion Quest: The Search for Bowser a game where you control the titular characters, 4 of Bowser's minions, to rescue their master during the events of the original game! And it's just one of the many great things Nintendo showed at E3.
