Cubot

Cubot is a robot built by Dr. Eggman to wait on him hand and foot and serves as one of his assistants. Cubot's main jobs are assisting Dr. Eggman in his schemes for world domination and making sure the processes of his plans are carried out correctly along with his counterpart Orbot. While Cubot is loyal to Eggman, he is dim-witted, lazy and will try to avoid work. He also has a faulty voice chip which causes him to randomly switch between different accents.

Mario & Sonic at the London 2012 Olympic Games
In Mario & Sonic at the London 2012 Olympic Games, Cubot makes several appearances in the game's different events, along with Orbot as referees. In London Party mode, Cubot is one of the helping characters, where sometimes, when placing a sticker on a question mark spot, both Orbot and Cubot will appear and copy an existing sticker on that page, placing it in a random spot that is not a question mark. Additionally, Orbot and Cubot have their own bonus game, "Orbot And Cubot Tag", where they will try to trap the players in metal cages.

Additionally, when speaking to Metal Sonic in London, Orbot and Cubot will appear above his head and talk to the player instead.

Mario & Sonic at the Sochi 2014 Olympic Winter Games
In Mario & Sonic at the Sochi 2014 Olympic Winter Games, Cubot appears alongside Orbot as one of the hosts for the Action and Answer Tour.

Mario & Sonic at the Rio 2016 Olympic Games
Cubot is the host of multiplayer games in Mario & Sonic at the Rio 2016 Olympic Games. You talk to him then he shows you the games you can play in multiplayer.