From the Super Mario Wiki
Bowser Statues (sometimes parsed Bowser statues and once specified as Gray Bowser Statues) are statues that look like Bowser and first appeared in Super Mario Bros. 3. They normally appear as stone busts of Bowser with gaping mouths. They mainly act as an inanimate object, usually for decorative purposes in levels, but sometimes fire projectiles at Mario. In most cases, they are indestructible.
Super Mario series
Super Mario Bros. 3
In Super Mario Bros. 3, Bowser Statues solely appear in Bowser's Castle. Some are harmless, but others shoot out a diagonal laser when Mario approaches. They cannot be defeated.
Super Mario World
Bowser Statues later appear in Super Mario World. They are hunched over compared to the more upright ones in the previous game. These statues shoot fireballs in a straight line in lieu of the laser beams. This game's Bowser Statues are also indestructible. Moving, golden variants called Gold Bowser Statues also appear, which hurt Mario when touched.
Super Mario Advance 4: Super Mario Bros. 3
Both the original Super Mario Bros. 3 and Super Mario World variants of the Bowser Statue appear in Super Mario Advance 4: Super Mario Bros. 3. They are found in the World-e level Bowser's Last Stand; the former can be found in the first room of the level, while the latter in the penultimate room before the Bowser fight, alongside Gold Bowser Statues.
New Super Mario Bros.
In New Super Mario Bros., in the Danger, Bob-omb! Danger! minigame, the Bowser Statue from Mario Kart: Double Dash!! makes a small appearance as the primary obstacle. This statue moves around, shooting fire in an attempt to burn a Bob-omb. Using the Stylus, the player must help the Bob-omb escape from the fire.
Super Mario Galaxy
In Super Mario Galaxy, they appear in the Ghostly Galaxy and Bowser's Galaxy Reactor as inanimate objects (although destroying them brings out an item or helps a player proceed through a level). In the Ghostly Galaxy, there are a few in the mission Beware of Bouldergeist. In this mission, a Bowser Statue covers the fireplace with a Launch Star inside. In Bowser's Galaxy Reactor, one makes an appearance on the Starting Planet, and several make an appearance inside the Tower Planet. When these are destroyed by a Bullet Bill, they release one coin each.
Super Mario Galaxy 2
The Bowser statues appear in Super Mario Galaxy 2 in Bowser's Lava Lair and Bowser's Galaxy Generator. The ones in Bowser's Lava Lair can rotate to face Mario, and create a damaging Electric Fence that Mario must jump over. The one in Bowser's Galaxy Generator is found on the Galaxy Generator Door Planet, and though considerably larger than the previous ones, serves for decorative purposes. They also appear in other galaxies but, as in the previous game, are inanimate. Bowser Jr. statues also appear in the Boo Moon Galaxy and Bowser Jr.'s Fearsome Fleet but merely act as decoration. Unlike the stone Bowser statues, the Bowser Jr. statues are metallic.
New Super Mario Bros. 2
Heads of Bowser Statues appear in New Super Mario Bros. 2. They can be found on walls breathing large fireballs that fly horizontally to the left. They appear in World 6-5 and World Star-7 as well as in the giant Bowser and Dry Bowser battles. The ones in the third part of both battles breathe purple fireballs which fly straight at Mario, similar to Ludwig von Koopa's blue magic blasts during his first battle in New Super Mario Bros. Wii.
Super Mario Odyssey
Bowser statues appear in Super Mario Odyssey, where they are seen in the Underground Moon Caverns of the Moon Kingdom. One Bowser statue near the beginning of the caverns can be captured and moved in order to reveal a hole underneath it with a Power Moon. Many golden-colored Bowser statues can be found in various locations and with various functions across Bowser's Kingdom.
Super Mario World television series
Bowser Statues, though never named, appear occasionally in the Super Mario World animated series. Bowser Statues first appear in the episode "Send in the Clown", where one attacks Mario by shooting a fireball at him while he is traveling through Neon Castle. Later in the episode, Mario accidentally stumbles upon another Bowser Statue, which proceeds to spit a fireball at him; Mario manages to narrowly avoid this fireball, which hits his Koopa Football Player pursuers. In a later episode, entitled "Mama Luigi", two Bowser Statues are shown to act as guards to the entrance of Neon Castle; additionally, a Bowser Statue is also found in the basement of Neon Castle. This Bowser Statue is eventually shut-down by Yoshi, who eats one of its spat fireballs and blasts the Bowser Statue with flames.
Mario's Time Machine
In the NES release of Mario's Time Machine, Bowser Statues appear in Bowser's Museum, where they use Bowser's graphics from Super Mario Bros. 3, and as such are the same size as him. However, two of their 8-by-8 tiles (the right hand and lower jaw) appear to have been switched by mistake.
Mario Kart series
In the Mario Kart series, Bowser Statues have appeared in Mario Kart 64, Mario Kart: Double Dash!!, Mario Kart Wii, Mario Kart 8, and Mario Kart 8 Deluxe in the Bowser Castle courses. In Mario Kart 64, the Bowser Statues are brown, and just stand in place shooting fire that cannot hit the racers (in the Mario Kart Wii version of this course, the shooting fire can hit the racers). However, in Mario Kart: Double Dash, it can move, and it shoots fire that can hit the racers. A similar one, now known as "Mecha Bowser," appears in Mario Kart Wii, but shoot bouncing fireballs with an hole-filled solid sphere in the center. Bowser Statues that shoot lasers from Super Mario Bros. 3 appear in Mario Kart 8 called Laser Statues. The course also features a giant Bowser Statue resembling the ones from Mario Kart: Double Dash!! and Mario Kart Wii called the Bowser Monument.
Mario Party series
Non-living Bowser Statues also appear in the Mario Party 2 and Mario Party 8 minigames Destruction Duet and Punch-a-Bunch respectively, where the objectives are to destroy them. In Mario Party 6, several immobile Bowser Statues appear in the Bowser minigame Dizzy Rotisserie; if a character does not complete this minigame in time, these Bowser Statues will spring to life and fill the arena in fire, roasting any characters that didn't make it to the finish. This minigame returns in Mario Party: The Top 100.
Super Princess Peach
Bowser Statues also appear in Super Princess Peach as inanimate objects, where they decorate the course where the initial fight with Bowser takes place. They only appear in that battle, where they can be crushed by Bowser's misused charge attack, resulting in a crystal for Peach to collect.
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Bowser Statues also make a minor appearance in Super Mario Maker and Super Mario Maker for Nintendo 3DS. If the player sets the course to castle-themed and puts many ground blocks across the level, Bowser Statues will eventually start appearing as foreground decorations. As such, they are harmless and cannot be interacted with.
Mario Tennis Aces
In battle, the Bowser Statue deploys a forcefield around itself, and launches sets of three fireballs at Mario which must be knocked back; if a fireball is not lobbed back, it becomes a stage hazard. The Bowser Statue will then fire a laser beam that sets the ground ablaze, finishing by firing a giant purple fireball which can be knocked back to deal lots of damage. The Bowser Statue will repeat this process until it is out of health, in which Mario must avoid the oncoming meteors to perform a Zone Shot at the statue's mouth. The statue will then repeatedly shoot streams of fire at Mario, then repeat its ball-serving mechanics, except it will more evenly space out the fireballs it shoots. After Mario fires a Zone Shot at it a second time, it will shoot streams of fire again, except perform a sweeping motion with them. It will then repeat the same ball-serving mechanics it used in the second phase.
Names in other languages