Omochao

Omochao is a Chao-shaped robot from the  franchise that makes several appearances in the Mario & Sonic series. In both series, Omochao usually appears in various places throughout the game to provide the player with advice and information. Omochao's name is derived from the Japanese word "omocha", meaning toy, combined with the species name Chao.

Mario & Sonic at the Olympic Games
Omochao makes a cameo appearance in the Wii version of Mario & Sonic at the Olympic Games, where he appears in the crowd for most of the events, as well as briefly during the game's opening.

Mario & Sonic at the Olympic Winter Games
Omochao makes appearances in the crowd in both versions of Mario & Sonic at the Olympic Winter Games. In addition to this, Omochao will also send the player some mail in the Wii version. He has a much larger role in the Nintendo DS version of the game, where he appears in the Adventure Tours mode of the game. Here, he can be found in various crates and barrels in each area, sometimes multiple times, and when found he will initially thank the player for helping him out of the box. Talking to him after this will allow the player to ask him for hints and information to help them progress through the mode. He also appears on the unlockable picture of the various non-playable characters.

Mario & Sonic at the London 2012 Olympic Games
As well as reappearing in the audience in both versions of Mario & Sonic at the London 2012 Olympic Games, Omochao also appears in the London Party mode in the Wii version, where the player can talk to him to play a minigame, and can also obtain a sticker with him on. He will also occasionally send the player mail. He also has a supporting role in the Nintendo 3DS version, where he appears in the 20km Race Walk Event and comments on the player's pace, as well as awarding penalties when they run. He also performs a similar role in Triathlon, where he gives hints pertaining to the event that the player is currently competing in at the start of each of them and when the player fails to perform the suggested action. Omochao also appears in the Story Mode where he accompanies the Heroes and assists them in investigating the Phantasmal Fog, and a badge of him can also be obtained from the badge machine.

Mario & Sonic at the Sochi 2014 Olympic Winter Games
Omochao makes another cameo appearance as a member of the crowd in Mario & Sonic at the Sochi 2014 Olympic Winter Games, as well as appearing as a reporter when the player achieves a new record in an event.

Mario & Sonic at the Rio 2016 Olympic Games
As well as making an appearance in the crowd once again, Omochao also appears running the Rio 2016 Item Stand on Copacabana Beach in the Wii U version of Mario & Sonic at the Rio 2016 Olympic Games.

Mario & Sonic at the Olympic Games Tokyo 2020
Omochao also appears in Mario & Sonic at the Olympic Games Tokyo 2020, where he once again appears in the crowd and has a role in the game's story mode. Here, several versions of him appear in the explorable Tokyo 2020 locations, and when talked to he will provide the player with facts about the location and the Olympic Games, occasionally providing them with a piece of trivia as well.