Charvaargh

Charvaarghs are a type of Magmaargh that attacks by jumping out of lava at any of the characters. Compared to Magmaarghs, they are lengthier and have appendages resembling wings or fins.

Super Mario 3D World
Charvaarghs make their first appearance in Super Mario 3D World. They appear in only one level, World Castle-7, Simmering Lava Lake where players must make it past them. If a character touches them, a life is lost, regardless of the character's form. Charvaarghs cannot be defeated by any method. They are also one of the only two enemies (including bosses) that can defeat the player in one hit, the other being Fuzzy Hordes.

However, most Charvaarghs only show up when the player enters a Clear Pipe for aesthetic purposes.

Super Mario Maker 2
Charvaarghs reappear as placable course elements in Super Mario Maker 2. They are unique to the Super Mario 3D World game style. Up to three Charvaarghs can be placed in a single course section. When placed, they will follow the player throughout the level and occasionally leap out in one of two ways. Either it will leap from the background, go high above the player's head, and then back down into the foreground, or it will leap from the bottom of the screen on the playable ground, and fly in an arc back down. If the Player's course is a Castle, Charvaarghs will start their ascents from the lava's surface, even when the lava level changes, a trait also shared by Lava Bubbles. Unlike in their debut appearance, Charvaarghs can be defeated with a Super Star, and touching one will simply power down players instead of taking them out instantly.

Captain Toad: Treasure Tracker
Charvaarghs return in Captain Toad: Treasure Tracker. They appear in lava stages either coming out of grates which Toad must walk across, or blocking his path where he must run across Dash Panels. They debut in Rolling Inferno. In this game, they do not instantly defeat the character.

Mario Party 10
Charvaarghs made their Mario Party debut in Mario Party 10. They appear in Chaos Castle in the Unlucky Spaces to take away the player's Mini Stars.

Super Mario Maker 2

 * North American website bio: "Beware the lord of lava, Charvaargh. This monster’s obsessed with gobbling up Mario."