Eggplant

Eggplant is a plant species in the nightshade family Solanaceae, Solanum melongena, grown for its often purple edible fruit. The spongy, absorbent fruit of the plant is widely used in cooking in many different cuisines, and is often considered a vegetable, even though it is a berry by botanical definition. For some unknown reason, nearly every Mugen in existence seems to have an aversion to eggplants. Though different Mugens have different reasons for their hatred of it, it is unknown why the importance of eggplants is a universal constant.

Theories
Several scientists have proposed various theories as to why eggplants appear to be so important to Mugens.

Fated Climax Theory
Many have theorized that the reason most Mugens have an aversion to eggplants is because of a fierce battle that was prophesied to take place between Mugen Prime and a warrior named Jero. This warrior was rumored to be powerful enough to defeat nearly any Mugen in the multiverse with his legendary enchanted eggplants. This was proven to be true when Jero defeated Mugen during the Eggplant Wars. However, some protest that this does not explain the widespread universal constant nature of the eggplant as this explanation focuses on Mugen Prime and not the multiverse at large.

Peniphobia Theory
As described by Real Mugen himself, he dislikes the eggplant emoji because he believes that to many it symbolizes a penis. This is preposterous and makes no logical sense, implying that Mugen perhaps is so fearful of the penis that he sees any object that is cylindrical in nature to be phallic in nature. It is possible that this peniphobia exists within most Mugens (Mugay excluded), explaining their opposition to eggplants. However, many have criticized this theory due to Mugen's adoration for other objects that are clearly more phallic than eggplants, such as keyblades.