Card Trivia:Thunder King Rai-Oh
- This card's Japanese name is "Raio" spelled in Katakana.
- The "Thunder King" in this card's English name is a literal translation of "Rai-Oh" (essentially making the name "Thunder King Thunder King").
- "Rai-Oh" coincidentally sounds like the Spanish word "rayo" and the Portuguese word "raio", which can be translated as "ray" or "thunderbolt".
- This card's name, appearance, and Thunder Type seem to be derived from Susano-o, one of the primary Japanese gods and deity of storms.
- This card's OCG/TCG artwork is taken from Yu-Gi-Oh! GX chapter 20: "Let the Tournament Begin!!", specifically from the panel showing this monster being Summoned.
- Though given away as a promotional card packaged with the second volume of the Yu-Gi-Oh! GX manga, this card's debut chapter was published in volume 3.
