Signature Colors

Colors and combinations thereof strongly associated with a specific character or group, whether as official heraldry elements or not — much like Signature Devices.

This is a subtrope of Color-Coded for Your Convenience. and Missing Supertrope of Color-Coded Wizardry and Color-Coded Patrician.

Anime and Manga

 * Unless she's in school uniform or kimono, Rin Tohsaka of Fate/stay night is consistently shown in official art wearing red and black. Even her official bikini is red. (Some scenes in Fate/Zero show her wearing red and white, showing that her accent colour has changed over time.)

Literature

 * In The Chronicles of Amber Amberites and related characters have "their" colors:
 * Dworkin: purple and orange.
 * Oberon: green and gold
 * Corwin and Deirdre: silver and black.
 * Eric: black and red.
 * Benedict: orange, yellow, brown.
 * Bleys: red and orange.
 * Brand: green.
 * Caine: black and green.
 * Delwin: brown and black.
 * Flora: green.
 * Gerard: blue and gray.
 * Julian: White.
 * Llewella: gray and green
 * Random: orange, red, brown.
 * Dalt: green and black.
 * Rein: crimson.

Video Games

 * Yggdra Union has it as an Identical Twin ID Tag: Aegina's favorite color is red, Luciana's favorite colors are black and blue.

Web Comics

 * Girl Genius
 * Tarvek usually wears dark red and white.
 * Bang wears bright red (presumably to not look bad with blood, except in this case not her blood) and white.
 * Martellus has at least one light golden piece on him, sometimes clothed almost entirely in such hues.
 * Albia usually wears white, except her gardening suit (this may also serve to underscore the "unofficial" status of that audience).
 * Princess Neena may be in her pajamas, fancy dress for a theme ball or in pants, blouse, corset and jacket when going about her daily business… but the cloth is always slightly greenish blue, and accessories (if any) are bright golden.

Web Original

 * Huntsmen and Huntresses in RWBY appear to have signature colors. It's more pronounced in the main characters -- Ruby's red and black, Yang's brown and saffron, Weiss's white and pastel blue, Nora's pink and white -- but it appears to be present in the stylings of the older generation as well.  Ruby and Yang's father, Taiyang Xiao Long, seems to have a similar color scheme to Yang's, for instance.