Tau

Tau is one of the many side characters in Lächeln und Regenbogen. Despite her minor role, she plays a major part in the story's world, especially with her relationship with Meridian.

Appearance
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Personality
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Backstory
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Relationships
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Trivia

 * She's supposed to represent the mathematical constant pi (π), but specifically the constant but multiplied by two (resulting in 6.2831). Similar to Pi, she does have a pie flavor theme to her design, being meringue key lime.
 * Her relation to Ceri is a reference to how this multiple's digit starts with a six.