Restaurant to Another World intro: Food.

Just like blue-haired girls are often withdrawn and anxious, pink-haired girls are often cheery and optimistic or sweet and romantic. There’s a high chance that, if a series has a Five-Man Band, a girl with pink hair is The Chick. It’s also a popular hair color for protagonists of Magical Girl series, hence Pink Heroine. Bonus points if she has a blue-haired love interest. She may also have Innocent Blue Eyes, both to reinforce the impression of innocent sweetness and to provide a distinctive visual contrast.  -TVTropes

Interestingly, these people also tend to be the most rational or intelligent in the group, perhaps because being socially timid is associated with bookworms. Sometimes, they seem very aloof and stoic, tending not to make any friends of their own. If they are, they are usually revealed as having a kind, friendly nature. -TVTropes

Green stands for balance, nature, spring, and rebirth. It’s the symbol of prosperity, freshness, and progress… Green is the color of the Heart Chakra, also known as Anahata… The Heart Chakra bridges the gap between the physical and spiritual worlds. Opening the Heart Chakra allows a person to love more, empathize, and feel compassion. - source