New Super Mario Bros. U

...design their boss encounters as homage to the final battles of old school Mario games.

Ludwig von Koopa (Donkey Kong): Evoking 100m, Ludwig stands on a platform conducting a symphony. Mario, etc. must remove the rivets to send him falling, while fires rain upon them.

Larry Koopa (Super Mario Bros.): Standard drawbridge scenario, like in the first Super Mario Bros. Throws hammers and fireballs (or wand blasts).

Morton Koopa (Super Mario Bros. 2/USA): Evoking Wart/Mamu, Morton fires a stream of bubble-like bursts from his wand. The Nightmare Machine (or something like it) returns to supply projectiles to toss at him.

Roy Koopa (Super Mario Bros. 3): Roy uses the ground-pound technique. Unfortunately for him, the floor is breakable....

Lemmy Koopa (Super Mario World): Lemmy rides in daddy's Clown Car this time, and uses an attack strategy similar to Bowser back then. But instead of Big Steelies, he drops his bouncy balls which end up allowing them to stomp him.

Iggy Koopa (Super Mario Land): Iggy steals Tatanga's spaceship, and the players must get in the Skypop to shoot him down

Wendy O. Koopa (Super Mario Land 2): Evoking Wario, Wendy uses the different power-ups like Fire Flower and Flying Squirrel Suit to battle Mario. (her rings replace fireballs)

Bowser Jr. (Yoshi's Island): Fights exactly like Baby Bowser, and then Kamek makes him turn huge. Meteors similar to SMG2 are used in the second phase.

<nintendo>Dodge attack. jump on shell. Dodge recoil. repeat 2 more times</nintendo>
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I have a legion of battle pigeons. Fear me.

I wish Nintendo was as smart to do something like that, I would seriously love it : /
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"Speak softly, and carry a big stick." -Theodore Roosevelt
3DS FC: 4339-2716-5379

The thing that they should do is take a page from Bowser Jr's NSMB debut and hide in their shells whenever you get close to them. That way, you can't just wait them out to hop on them as soon as they get out of their shells.

Also, get rid of the wands...they could all breathe fire.

I bet when they have board room meetings a lowly employee mentions an idea like this and Iwata's gestapo takes care of him.