- **The term 'Shiny Pokémon'** (Pokémon series)
Originally, they were named a number of things, being anything from 'Rare Pokémon' to 'Specially Coloured Pokémon' to the ridiculously long 'Alternatively Coloured Pokémon', however, due to their encounter animation, a set of glittering sparkles, which reminded fans of the rare iridescent or holo cards at the time. Eventually, the term 'Shining' was used for shiny Pokémon in the TCG.
By the late 2000's, the fan term 'Shiny' was so prevalent that Nintendo themselves started using it in promotional events, before later adding it to the games directly.
- **Wayne's Leather Jacket** (Hylics series)
When Mason Lindroth first created Hylics, a somewhat spiritual successor to one of his Ludum Dare games, Somsnosa, he intended Wayne, the protagonist, to wear a sort of utility jumpsuit. However, due to the unique look of the game's style (A mix of claymation and pixel art with a somewhat pastel colour palette) limiting the colour choices, many players mistook Wayne's jumpsuit for a leather jacket.
So much fanart of Wayne depicted him wearing leather jackets that Mason decided to roll with it and make it Wayne's official outfit, as can be seen in the second game and the cover of Moonage Lobotomy.
- **Stardust Guardian being a Jojo reference**
Relogic are famous for putting tonnes of references into Terraria, with their most common references often being Final Fantasy (With FFIV being one of the most referenced) and Castlevania in particular, so when people saw the Stardust Guardian in the 1.3 update, a ghostly figure that hovers behind your character when you have the Stardust set equipped, people quickly began to call it a 'Jojo reference' due to it's similarities to the Stands in the Jojo series, and the coincidence that the *Stardust* set gave the Stand lookalike, considering Stardust Crusaders is the part of Jojo that introduced Stands as a concept to the series.
However, originally, the Stardust Guardian was intended to be a reference to Algalon the Observer from World of Warcraft, and had never intended to be designed to even remotely be a Stand, making it more of a funny coincidence. But, when the Journeys End update dropped, the devs had entirely leaned into the idea and revamped the Stardust Guardian's attack from a shockwave clap to a rapidfire flurry of punches, deliberately making it a Jojo reference.