Color

Colors are the result of light bouncing off of stuff and reaching our eyes and more science stuff you can look up if you really care since this is the Internet and we're too lazy to write the entirety of how colors work. In fiction, color has a subtle but powerful importance that is deeply embedded in all of us. Each color's role in fiction is unique and has different functions depending on where the color appears, when, and on what.

General
Black is an extreme color that is the opposite of white. It's the darkest color of all. Along with red, it's a color of evil. Black is the most common color of text overall, from books to web pages. Black can mean death, mystery, the unknown, or corruption.

General
Blue is one of the three primary colors — the other two being red and yellow. It's the color of water, the sky, and Earth from an orbital view. Blue is perceived as a passive and emotional color, which is why the phrase "feeling blue" refers to when someone is feeling sad.

Video Games
Blue can be a color of good. In video games, it could be the color of the player's team. However, in games like Super Smash Bros., red is the default color of the player's team. In RPGs, blue is a color that denotes the player's mana or items that can restore their mana.

General
Gray is a color that is a mixture between black and white. It often means boredom, but could also be indifference or neutrality.

General
Green is a secondary color that is made by mixing blue and yellow. It's a color that simultaneously symbolizes good health and disease. Dark green is a more sickly color, while brighter shades mean life and good health. Green is the most prominent symbol of nature, with brown and blue also being colors of nature.

Books
Green can symbolize jealousy, greed, and money (specifically good wealth or fortune). Some magic is green, as are potions with such properties. A green potion is likely a dangerous one, being filled with poison or another harmful substance.

Video Games
In video games, green is the color of health and things that can heal the player, but is also the color of poisonous substances. Green can be the color of experience, such as in the games Minecraft and some Pokémon games.

General
Red is one of the three primary colors — the other two being blue and yellow. As animal blood is red, the color could symbolize violence, pain, and danger. Incorrect tests in school often get an X or number (the percent of correct answers) written in red. Red is also viewed to be an aggressive and angry color, which is often why it's identified as a color of evil.

Video Games
In video games, it can be the color of the enemy team. In RPGs, red is a go-to color for healing potions. It can also be the color of health bars, especially when they're low on HP.

General
White is an extreme color that is the opposite of black. It's the brightest color of all. It's a color of good, like blue.