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Senri Shiki's twin brother was both very similar and very different to Senri. With a powerful birth defect that haunted the vampire's ability to appear human, the elder Shiki easily fell into step with his brother when everyone else feared him.
One eye that could be the most calming of grey and the other the most sinister of reds.
Those are the eyes of Shou Shiki [奨, 千里] Kaname Kuran's cousin.