Easter Eggs from the Star Fox series have been found in a few games in different series created by Nintendo. They most likely occur in Mario games. They rarely appeared in other Nintendo games, such as F-Zero and Animal Crossing.
In Super Mario RPG: Legend of the Seven Stars, the Arwing appears as a small figurine in the Shop Hall within the Barrel Volcano while Mario is on the quest to find the sixth Star that was nearly taken away by the Axem Rangers for good. In Mario Golf 64, some common names, like Peppy Hare, appear in the tournament results hole after hole in certain Golf courses. In Mario & Luigi: Superstar Saga, one of the items that was supposed to be given by Fox McCloud is actually given to the Mario Bros by Professor E. Gadd for allowing him to sample one of the Coffee items created with a sufficient amount of beans found in the Beanbean Kingdom.
In F-Zero games, excluding the SNES games and Maximum Velocity, James McCloud, who was Fox McCloud’s father, also appeared to be in human form racing in F-Zero Grand Prix with the Little Wyvern as a modified machine from the Arwing. These Easter Eggs were actually developed to honor James McCloud in the StarFox series.
In the Animal Crossing series, excluding New Horizons, the Arwing appears in the Nintendo Set. However, the player who controls their avatar village must obtain it under certain circumstances in the corresponding game titles. In Animal Crossing: New Leaf, you can obtain the Arwing if you give Timmy or Tommy a fortune number that makes them give said furniture to you as an Easter Egg.
In The Super Mario Galaxy Movie created by Universal Studios and Illumination, Fox McCloud appeared as a main character and an Easter Egg alongside his Arwing as he agreed to help Princess Peach, Toad, Mario, Luigi, and Yoshi save Rosalina from Bowser Jr., who managed to save and reunite with Bowser. Fox McCloud also introduced himself with a personal story that mentions Falco Lombardi, Peppy Hare, and Slippy Toad, who also appeared as Easter Egg characters.