Sonken Chuubou is a new character introduced into Shin Ikkitousen, the direct sequel of Ikkitousen. She is the sister of Hakufu Sonsaku related by their father.

She appears for the first time in the first chapter of the first volume. She's a new student entering Nanyo Gakuen, but doesn't possess a magatama yet. Ukitsu, still alive in the manga, is in charge of giving her the magatama of Sun Quan.

Like her sister, the "soul" in her magatama take the form of a water dragon (water being the natural element of the "Sun lineage").

(Source: Ikkitousen Wiki, edited)