An eggplant stamp is visible on an envelope when submitting a solution to a puzzle.
Kid Icarus features an enemy called Eggplant Wizard which has an eggplant cane that shoots out eggplants that turn the main protagonist into an eggplant.
Eggplant was or is a planned unit in Plants vs. Zombies: All Stars that is not available in the game (yet?), but we can find it in the game files.
Eggplants in Super Smash Bros. Brawl appear on the stage called The Summit. They can be eaten to replenish the characters’ health. There’s also a trophy called Vegetables in which one of the featured vegetables is an eggplant.
Super Smash Bros. Melee features a trophy of a character called Eggplant Man which originally debuted as an enemy in Wrecking Crew (NES) game. This trophy can only be won in the lottery mini game.
There is few eggplant related things in Final Fantasy XIV: A Realm Reborn.
Wizard Eggplant and Doman Eggplant icon.
Eggplant Flower Vase icon.
Stuffed Eggplant Knight icon.
Eggplant Knight minion.
In Chinese version of Plants vs. Zombies 2 there is an Eggplant Ninja unit. It attacks by throwing shurikens at zombies which will damage it until it dies. In addition, every fifth Eggplant Ninja to be planted will release a tornado shuriken which will send the targeted zombies off-screen. It has “Legendary” rarity and is unlocked by collecting 10 Eggplant Ninja puzzle pieces.
Eggplant Ninja and Eggplant Ninja puzzle piece.
Eggplant Ninja costume and Eggplant Ninja costume puzzle piece.
Official advertisement showcasing gameplay.
Sadly, there is no eggplant item in Rocket League, but for April Fools 2017 the developers remade the ranking system, which featured “Grand Eggplant” as the highest achievable rank in game.
Grand Eggplant – Only the best Rocket League players have grown their skills enough to reach this exclusive rank.
You can read the rest of the Rocket League’s April Fools 2017 blog post here.
Princess Tomato in the Salad Kingdom features a character called Miss Eggplant which owns and operates a Juice Bar. There’s also the Eggplant Soldier which appears late in the penultimate chapter and he’s one of the last enemies you have to fight.