Top 10 Characters that Could Be an Alternative to Replace Mario as Nintendo's Mascot

The Top Ten
1 Pikachu Pikachu (Japanese: ピカチュウ) are a species of Pokémon, fictional creatures that appear in an assortment of video games, animated television shows and movies, trading card games, and comic books licensed by The Pokémon Company, a Japanese corporation. A mascot of the Pokemon franchise, it's considered to be the most iconic character of all Pokemon species, as well as a major character in Japanese pop culture, due to its companionship with Ash Ketchum in the anime series. Pikachu has been featured in movies such as Pokemon Detective Pikachu as well as music videos - most notably Katy Perry's "Electric" in 2021.

Since Pokemon in the most second well known Nintendo franchise, and Pikachu is their most well known character, it might be a good option

Yes, Pikachu would be a good alternative

2 Kirby Kirby is a fictional character and the protagonist of the Kirby series of video games owned by Nintendo and HAL Laboratory. His first game was created in 1992, and the pink puffball has made his way into the hearts of fans of all ages.
3 Link Link refers to several different incarnations of the same protagonist of Nintendo's The Legend of Zelda series.
4 Luigi Luigi, originally a palette swap of Mario named Green Mario, is a major character featured in video games and related media released by Nintendo. Created by prominent game designer Shigeru Miyamoto, Luigi is portrayed as the slightly younger, taller fraternal twin brother of Nintendo's unofficial mascot Mario, and appears in many games throughout the Super Mario franchise, often as a sidekick to his brother.
5 Yoshi Yoshi, once romanized as Yossy, is a fictional anthropomorphic dinosaur who appears in video games published by Nintendo. Often appearing as a sidekick and helper to Mario, Yoshi is most known for his appearances in the Yoshi's Island and the Super Mario franchises.
6 Samus Aran Samus Aran is the protagonist of the science fiction action-adventure game series Metroid by Nintendo. A galactic bounty hunter, Samus is usually equipped with her Power Suit, giving her access to weapons she uses to battle her enemies.
7 Donkey Kong Donkey Kong is an arcade game released by Nintendo in 1981. It is an early example of the platform game genre, as the gameplay focuses on maneuvering the main character across a series of platforms while dodging and jumping over obstacles.

Donkey Kong is the most reasonable alternative.

8 Princess Zelda Princess Zelda is a fictional character in Nintendo's The Legend of Zelda video game series, created by Shigeru Miyamoto and introduced in its original entry in 1986.
9 Eevee Eevee, known in Japan as Eievui, is a Pokémon species in Nintendo and Game Freak's Pokémon franchise first introduced in the games Pokemon Red and Blue. Considered as the evolution Pokemon, it has the most evolutions out of all Pokemon species. Eevee can evolve to Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, and Sylveon depending on the method used. It serves as the mascot in the game Pokemon: Let's Go, Eevee!
10 Mewtwo Mewtwo is a psychic-type Legendary Pokémon from Nintendo and Game Freak's Pokémon media franchise. Designed by Ken Sugimori, it made its first appearance in the games Pokémon Red and Blue. It was created by Dr. Fuji using gene splicing in an attempt to clone Mew. In the Pokémon games, it's infamously known as the most powerful Pokémon among all species. Mewtwo is capable of evolving into two forms - Mega Mewtwo X (using Mewtonite X) and Mega Mewtwo Y (using Mewtonite Y)
The Contenders
11 Captain Falcon Douglas Jay Falcon, known commonly as Captain Falcon, is a playable character in the racing video game series F-Zero.
12 Bowser Jr Bowser Jr., or sometimes simply Jr., is a video game character who appears in Nintendo's Mario franchise as the secondary antagonist. He is the youngest son of the series' primary antagonist, Bowser.
13 Master Hand
14 Mr. Game & Watch Mr. Game & Watch is a 2D generic stick figure-styled silhouette character, created by Nintendo and an amalgamation of the Game & Watch handheld consoles.
15 Skull Kid
16 Waluigi Waluigi is a lanky self-centered, brusque young lad as he is considered evil and the main rival of Luigi. Waluigi is shown causing local havoc in most games he appears in alongside his partner Wario. Waluigi is not instinctively evil or the antagonist (not counting DDR), as a matter of fact, he shows great compassion for his fellow peers, typically for characters Daisy and Wario. Waluigi is also described as lonely, rejected, sad, or depressed due to his relationship with the Super Smash Bros. franchise, and people outside of Nintendo continually rejecting him. In recent years, people have come to Waluigi's defense, giving him support and even starting a cult following. In sum, Waluigi is the most mysterious, complex, and emotional character in the Mario franchise. ...read more.
17 Staryu
18 Gliscor Gliscor, known in Japan as Glion, is a Pokémon species in Nintendo and Game Freak's Pokémon franchise.
19 Gligar
20 Meta Knight Meta Knight is a fictional character from the Kirby series of video games owned by Nintendo and HAL Laboratory. He is one of Kirby's rivals, but occasionally teams up with the pink puffball to defeat a common enemy. Meta Knight is known for his powerful slashing attacks and flight in the Super Smash Bros games, and is widely considered to one of the best characters to appear in the series.
21 Tingle
22 Red Red is a Pokémon Trainer from Pallet Town, Kanto. He is the first character to be playable in the Pokémon series and his initial appearance is set in the Generation I main games. He has since then made various appearances in Pokémon media, including the Generation III remakes of Red, Green, Blue, FireRed and LeafGreen.

I have seen lists similar to this one.

23 Larry Koopa Larry Koopa is the youngest koopaling. He first appeared in Super Mario Bros 3, which came out in 1990. He is known for his blue mohawk hair. He was created by Nintendo.
24 Tom Nook Tom Nook, known in Japan as Tanukichi, is a fictional character in the Animal Crossing series who operates the village store.
25 Isabelle
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