Link is a “cute little elf” from Hyrule and the protagonist of the video game series The Legend of Zelda.
After Mario meets the Wizard, Link appears and tries to take his sword back. Mario doesn't take Link seriously, calls him a "cute little elf" and tells him that he paid 500 coins for the sword, so there is no way he is giving it back. Eventually, Link gets tired of Mario and starts to chase him while yelling "CHOCOLATE!!!!".
Link gives Dr. Mario a water bottle after he sees him trying to break the water vending machine. Mario gave Link a real heart to thank him, but he later found out that the water bottle was empty.
Link appears later again in the episode, heavily injured (or dead) on the hospital's floor.
Link was one of the people that were invited to the swag party. He can be seen laying dead inside Peach's castle.
He appeared in the blooper as a major role.
Link is the boss in SMG4'S boss battle and everyone tried to defeat him to win the challenge and the golden Mario trophy. Link stabs toad in the head, kills Wario with a spiny shell and crushes Peach with his monster kart, even though she wanted to be friends with him. That caused Bowser to fly towards the Boss full of anger, but Link diverted him, making him fall into the lava. Waluigi tries to attack Link using a shell, but he lost his confidence after Link gave him the death stare, so he jumped into the lava. Mario, Fishy Boopkins and Luigi charge at Link, but he used a star to become invincible, instantly killing the trio. After the battle is over Link celebrates his victory.
He appears in The slope challenge, where he avoids all the falling objects with ease while singing Staying Alive. Later, in The wheel, he tries singing And I will always love you. However, his singing was so awful that it caused a train to appear and crush him.
Link is only seen in the Archery segment, where he tries to get everyone to be as good as him. Everyone seems to be horrible at the sport, especially Wario and Waluigi. However, Meggy was proven to be very good at archery, landing bullseye after bullseye, impressing Link.
Link was having a fight with Kermit The Frog, threatening him, but then the storm reached the two and killed them.
Link appears with his attire from The Legend of Zelda: Breath of the Wild. Luigi feels embarrassed about Mario's behavior and compliment Link's Hair. He asks if Link is a girl now, causing Link to put a bomb in his mouth.
In the first trial, SMG4 is paired up with Link. SMG4 asks Link what his challenge will be, and Link points at a target in response. SMG4 breaks the target and asks where the next one is. Link points at a target across a river, SMG4 thinks all he will have to do is swim, but Link pulls out a button which releases sharks in the river. SMG4 asks Link how he expects him to get across now but Link just flies off using his sword.
Link first appears after witnessing the battle between Mario and the Luigi sword and Steve and the Waluigi sword. Impressed with the swords, he threw away his master sword for the winning sword, which happens to be the Waluigi sword (which he called as Wahster Sword).
He later reappears enjoying his new sword just to be rightfully horrified upon looking up to see that the Angry Moon was on collision with the planet. He was subsequently wiped out from the impact.
Link appears with his attire from The Legend of Zelda: Breath of the Wild, in the battlefield, Mario can be seen coming out a pipe, Captain Falcon coming out from his Blue Falcon saying "Show me your boobs" while Link falls on the floor and yells. Villager appears as well. While Mario prepares to have an epic smash battle with everyone, he eventually notices that the countdown is missing, which causes Crazy Hand to appear and the episode to begin.
After Waluigi goes outside to find a special move, he sees Link from Breath of the Wild use his special move which is flying with his sword. Later, Link from The Wind Waker can be seen showing off his special move (Bombs) alongside Samus and Snake.
He appears as one of the forbidden items that Area 51 has been keeping: In this case because his head is misplaced.
He makes a cameo in the background.