Mecha-Bowser

Mecha Bowser is a huge Bowser-shaped robot that has made several appearances in some form or another in other games, including another main series title and various spin-offs.

Luigi's Mansion
Before the Official first appearance of Mecha Bowser in Super Mario Sunshine, in Luigi's Mansion, A Bowser Mech Controlled By King Boo appears as the final boss. It will attack by spawning spike balls and bowling them towards Luigi, breathing fire, inhaling Luigi similar to that of Kirby, or, if the Player moves too far away, jump up into the air and attempt to body slam Luigi. When using the Poltergust 3000 to vacuum one of the spike balls that The Mech spawns, Luigi can wait until it lowers its "head" to attack, and launch the spike ball at it, causing King Boo to come out long enough for Luigi to vacuum him up for a limited amount of time before going back into the suit. When King Boo is down to a certain amount of health, the Bowser Mech's head will be put on backwards when King Boo goes back in to control it. This will cause it to run around the Roof arena the fight takes place on aimlessly for a short period of time before rotating its head back in position to attack once more. After King Boo is defeated, The Head collapses and the Body falls On the Ground.

Super Mario Sunshine
Mecha Bowser is found in Episode 1 of Pinna Park and is controlled by Bowser Jr. To fight it, Mario, riding the park's roller coaster, must collect and fire Water Rockets (via F.L.U.D.D.) at Mecha Bowser. Mecha Bowser attacks by shooting Bullet Bills at Mario, and by breathing fire on the Roller Coaster track, which can be doused using F.L.U.D.D. After enough hits, the robot explodes, and Bowser Jr. pilots its head away to escape.

Super Mario Galaxy
Mecha Bowser appears in the Toy Time Galaxy in the Heavy-Metal Mecha Bowser mission; however, its appearance has been drastically altered from that in previous games. It is now a toy robot and, out of all of Mecha Bowser's incarnations, resembles Bowser the least. It also sports a blue and green color scheme. To "defeat" Mecha Bowser, Mario must climb on its head, dismantling portions on his way, and then Ground Pound through the rocks on top to cause the robot to explode and free the Gearmos inside it.

Mario Golf series
While Mecha Bowser does not physically appear in the series, its name appears on scoreboards in Mario Golf: Toadstool Tour and Mario Golf: Advance Tour.

Mario Power Tennis
In Mario Power Tennis and its Wii port, Mecha Bowser is the boss of the Mecha-Bowser Mayhem minigame, in which it tilts the court and battles players, firing Bullet Bills and Bob-ombs that can be deflected back at it. Players must attack it with charged tennis balls until its rampage is quelled.

Mario Party series
In Mario Party 5, Mecha Bowser is a giant toy on the Toy Dream board and shoots characters out of a cannon in its mouth to another location on the board whenever they land on a nearby ? Space. In Mario Party 7, its head is a feature of Bowser's Enchanted Inferno!. In Mario Party 9, its head is featured on the Bowser Station board as a Jackpot Machine. It stores Mini Stars, and players can earn these stars by playing minigames or by landing on Jackpot+ Spaces.

Mario Kart Arcade GP series
In Mario Kart Arcade GP and Mario Kart Arcade GP 2, when finishing the Bowser Cup with Bowser, Mecha-Bowser replaces Giant Bowser in a boss fight. His tactics are the same as Giant Bowser. The player have to throw Black Shells at the pillars supporting Mecha-Bowser to defeat him.