- Shinmyoumaru is based on the One-Inch Boy.
- Her first name, Shinmyoumaru (針妙丸(しんみょうまる)), means "cirling strange needle" and her last name, Sukuna (少名(すくな)) means "small being".
- A silhouette of Shinmyoumaru appears on the front of Double Dealing Character's jewel case.
- One of her spellcard in Double Dealing Character is Attack on Kobito (進撃の小人), which is a reference to the anime series Attack on Titan (進撃の巨人).
- Strangely during her second non spell card, she has the biggest life among all the bosses known. (Except for older game bosses.)
- Shinmyoumaru is one of the only 2 final bosses that is a subordinate of an earlier boss (Seija), with the other being Utsuho.
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