This list contains characters that have at least one appearance in the series, but were (or were) absent for a while.
Diddy Kong is a fictional character in the video game series Donkey Kong, first published in 1994 in the game Donkey Kong Country.
Diddy was a fan favorite in Double Dash and Wii. He unfortunately has the short end of the stick in Mario Kart 8 and Deluxe. However, he has a high chance of returning – Gametheorysucks
Same situation as Diddy. She was a fan favorite who was sacrificed in Mario Kart 8 and Deluxe for Baby Characters Metal Characters and Koopalings in the Mario Kart 8 and Deluxe roster. Your return is very likely – Gametheorysuck's
Birdo is my favorite Mario character ever, and then she just disappeared, I understaffed Mario Kart7, but why did not she come back to Deluxe? And this clone Dry Bones still appears! – darthvadern
Is it because she is technically transgender? I wonder (I think she's great)
If you do not believe me, look at it – Masochismismagic
He was in Super Mario Kart and has never been seen or even mentioned in any game since then. A return would be highly unlikely at this time – Gametheorysucks
He was only visible in a double strike and unfortunately was canceled by Mario Kart Wii. A return seems unlikely, but possible – Gametheorysucks
He was only in Wii and has yet to return. He is in the same boat as Petey, his return is unlikely but possible – Gametheorysucks
Only seen in DS and he was not a bad character, but his return is very unlikely because he is not really a Mario character – Gametheorysucks
King Boo was absent for a while but luckily he returned to deluxe. – Gametheorysucks
Bowser Jr. or sometimes Jr. is a videogame character who appears in Nintendo's Mario franchise as a secondary antagonist. As his name implies, he is the son of the series' primary antagonist, Bowser.
He was absent in the original Mario Kart 8, which has driven people crazy and rightly so. He should have been there with the Koopalings, but fortunately Nintendo has him in Deluxe – Gametheorysucks
Dry Bones is a common enemy in the Super Mario series of Video games since "Super Mario Bros. 3" (1988). After his first debut as a playable character in "Mario Superstar Baseball" (2005), he became a fan favorite and was also playable in other spin-offs of the Mario series.
Appeared in DS and Wii and was absent until He returned to Deluxe. – Gametheorysucks
His only appearance was a one-two strike and unfortunately he was canceled by Mario Kart Wii. – Gametheorysucks
Uh, I think it's a good thing he never came back, he's just a Koopa clone – darthvadern