Love Live! Literal Image Colors According to the Website Linked at the Very End of This Post

Honoka - Zest

Kotori - Oslo Gray

Umi - Fun Blue

Rin - Ripe Lemon

Hanayo - Apple

Maki - Brick Red

Nico - Cranberry

Nozomi - Affair

Eli - Scooter

Tsubasa - Twine

Erena - Vivid Violet

Anju - Hot Cinnamon

Chika - Buttercup

You - Picton Blue

Riko - Light Orchid

Hanamaru - Barberry

Ruby - Blush Pink

Yoshiko - Gray

Mari - Medium Purple

Kanan - Bright Turquoise

Dia - Amaranth

Sarah - Affair

Leah - Strikemaster

Ayumu - Mauvelous

Ai - Jaffa

Setsuna - Mandy

Kasumi - Broom

Rina - Gray Chateau

Shizuku - Malibu

Emma - Atlantis

Kanata - Tapestry

Karin - Scampi

Website: Here

The color codes are based on the ones on this website.