Zenkuro Kurogane, also known as Zac the Sunrise, has an older brother who was revealed to be Count Night in the BeyBlade Burst Turbo Manga, in a short color four panel at the end of Volume 9.

The creator intended this to be a sort of day and night sort of thing, in which Zac represents the sun and Count Night represents nighttime.

Zac, however, is unaware of his brother's evil ways. They're quite friendly with each other and visit for frequent beyblade battles.

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