Dry Bones

Dry Bones are a skeletal counterpart of Koopa Troopas from the Mario franchise, in which they first appear in Super Mario Bros. 3, and for Sega-related media, Dry Bones first appear in the Wii version of Mario & Sonic at the Olympic Games. In the Super Smash Bros. series, Dry Bones only make a few cameo appearances.

In most of their appearances, Dry Bones have gray skin, a dark gray shell, black eyes, yellow pupils, and pale blue shoes and gloves. A Dry Bones' shell looks similar to that of a Koopa Troopa's, except it is gray and has black patterns in between each shell segment.

Mario & Sonic at the Olympic Games (Wii)
In the Wii version of Mario & Sonic at the Olympic Games, Dry Bones are featured as referees.

Mario & Sonic at the Olympic Winter Games (Wii)
In the Wii version of Mario & Sonic at the Olympic Winter Games, three Dry Bones appear along with Dry Bowser as the final rivals in Festival Mode in the event Ice Hockey on the last day. Dry Bowser is the goalie and there are three Dry Bones as the field players. In Team Festival Mode, a fourth Dry Bones takes the place of Dry Bones.

Mario & Sonic at the Olympic Winter Games (Nintendo DS)
In the Nintendo DS version of Mario & Sonic at the Olympic Winter Games, Dry Bones is a rival encountered on Icepeak in Adventure Tours. The characters must beat him in a match of Curling to win and progress further into the area.

Mario & Sonic at the London 2012 Olympic Games (Wii)
Dry Bones appears in the Wii version of Mario & Sonic at the London 2012 Olympic Games, where it appears as the rival for Table Tennis - Singles and Dream Hurdles in London Party Mode. When the player defeats it, they'll win a sticker. Dry Bones also appear as one of the characters that can be spoken to on the map in order to play a minigame.

Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)
In the Story Mode of Nintendo 3DS of Mario & Sonic at the London 2012 Olympic Games, Dry Bones first appears protecting the Phantasmal Fog alongside Dry Bowser in Foggy Foes, where they intimidate Toad and Omochao before challenging Mario and Luigi to Sailing - 470 (Pair). After their defeat, Mario and Luigi destroy the Fog machine and the pair leave before they can be questioned. Dry Bones also appears alongside several other characters for the opening ceremony. In The Life of a Minion, Dry Bones appears alongside Lakitu to help set up a challenge for Bowser with Knuckles and Vector, which they do by having Magikoopa transform them to look like Espio and Charmy. The pair manage to distract Knuckles and Vector for long enough so that Magikoopa can stun them, though Dry Bones almost gives them away as it only speaks with clicking sounds, and after Bowser defeats Knuckles and Vector, Dry Bones and Lakitu stay behind to calm them down. Dry Bones also appears in Mario's Defeat?!, in which it distracts Bowser while Goomba is transformed to look like Mario, being ruled out itself due to the way that it speaks, and later when Goomba is being changed back. A badge of Dry Bones can be obtained from the badge machine.

Mario & Sonic at the Rio 2016 Olympic Games (Nintendo 3DS)
In the Nintendo 3DS version of Mario & Sonic at the Rio 2016 Olympic Games, Dry Bones makes its series debut as a playable character, in the BMX event.

Super Smash Bros. Brawl
In Super Smash Bros. Brawl, Dry Bones makes a cameo appearance in the form of both a trophy and a sticker, the latter depicting its Mario Party 7 artwork. Despite being a Mario enemy, Dry Bones's sticker is only usable by Lucario, a Pokémon. The game's files suggest that it would have appeared as an enemy in Adventure Mode: The Subspace Emissary.

Super Smash Bros. for Nintendo 3DS
In Super Smash Bros. for Nintendo 3DS, there is another trophy of Dry Bones.