- The "Elemental HERO" monster designs were mostly based on American super heroes; the inspiration for Wildheart was most likely Ka-Zar of Marvel Fame or possibly Anthro or Kamandi of DC (the first and the last boys on earth respectively). Or possible Apache Chief from the DC Super Friends.
- It could also be based on the pulp fiction character Conan the Barbarian.
- It may also be based on William Wallace from Braveheart
- This card's effect, Level, and ATK are the same as "Tenkabito Shien".
- This monster and "Elemental HERO Clayman" are the only "Elemental HERO" monsters whose Alternate artworks in the anime (while being used by the Supreme King) are not in the TCG or OCG.
The Fusions of "Wildheart" appear to be "Wildheart" wearing his Fusion partner's armor/costume.
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