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Sei, is a reccurring character from Yu-Gi-Oh! ZEXAL and is often seen hanging around with Tori Meadows and Sachi.

Pre-World Duel Carnival
After Flip defeated the Candy store owner, he walked past Sei and Tori who were eating candy. Flip somehow turned the candy around in their hands whilst walking past, shocking Sei in the process.

World Duel Carnival
During Yuma Tsukumo's duel with Kakeru Kunitachi, a hologram of Sei and Sachi appeared beside Tori via the effect of the "Dream Pitch" Field Spell Card. They later disappeared after Yuma defeated Kakeru.

On the third morning of the World Duel Carnival, Sei was watching Nelson Andrews' duel with Gauche. When ever Nelson was in trouble, she screamed, but was overjoyed when he came out on top. However, she was ultimately shocked when Nelson lost. When he left the area, she followed with joy in her eyes alongside the rest of his fan girls.