Kokoro Yushin

Kokoro Yushin is the main character of Yu-Gi-Oh! Boost. She is first seen riding a bike toward a park, where her friends Yōsei and Kyōryū are Dueling.

Etymology
Like other main protagonists, Kokoro’s name contains the Yu syllable. Specifically, the syllable is in her last name, similar to and Kohaku Yudin. “Kokoro” means “heart”, but “Yushin” has no actual meaning, chosen only to keep the “Yu” syllable.

Deck
Kokoro plays a DARK Spellcaster Deck, focused on summoning her ace,” Dark Magician of Destruction”