Towa Kannagi is an antagonist in Mermaid Saga. She is the sister of Sawa Kannagi. She is fed mermaid blood to cure her illness when she was young, causing her hair to turn white, her illness to be cured, her aging to stop, and her hand to be permanently transformed into that of a Lost One.

Though portrayed as an antagonist, Towa is painted in a more positive life towards the end as it is revealed that Sawa fed her mermaid blood knowing that very few actually become immortal and that it has severe side effects.

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