Ceruledge is a bipedal, humanoid Pokémon. Its body is primarily black, with dark blue colorations on its arms and legs. Its head has sharp pale blue "ears" protruding from either side, and is blue on top, with a fire burning above it that resembles the plume on a knight's helmet. Its eyes have pink sclerae and wisps emanating from its white pupils. Almost all of Ceruledge's body is covered in an old dark purplish blue suit of armor, filled with grudges. A plate with three pink indentations on its center covers Ceruledge's face. Instead of hands, Ceruledge wields purple-cyan blades created from both fire and ghost energy — specifically, the lingering regrets of the deceased. These blades can grow into great swords in battle, increasing Ceruledge's power in the process.
Ceruledge is merciless and will do anything to win a battle. It prefers to do close-quarters combat, with a mix of sneak and surprise attacks. By using its quick speed to locate a foe's blind spots, it will then move closer before slashing them with its large swords. Any cuts from Ceruledge's swords will cause wounds that leak life energy, which the swords then absorb.
Ceruledge is the only known Pokémon capable of learning the move Bitter Blade.
- Ceruledge has the same base stat values as its counterpart Armarouge, just assigned to different stats.
Ceruledge may be based on a possessed suit of armor and an akuma, a Japanese fire spirit often depicted carrying a sword. The armor itself closely resembles those worn by European knights.
Ceruledge may be a combination of cerulean (a shade of dark blue) and edge.
Soublades may be a combination of 蒼 sō (azure) or soul and blades. It may also involve blaze or レイス reisu (wraith).